The most useful CSP response to a compromised website is a restrictive, browser-enforced allow-list: deny capabilities by default, authorize only the scripts and destinations the application actually needs, and control outbound connections, forms, frames and legacy objects. A practical starting point is default-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'nonce-{per-request-random-value}'; style-src 'self'; img-src 'self' data:; font-src 'self'; connect-src 'self'; frame-src 'none', with violation reporting enabled.
CSP limits what injected or altered page content can do in visitors’ browsers. It does not remove the attacker from your server, restore modified files or replace incident response. Treat the policy below as a starting pattern: inventory the application, add only demonstrably required origins, test in report-only mode, then enforce the reviewed policy.
As an Amazon Associate I earn from qualifying purchases.
What CSP can and cannot do after a compromise
Content Security Policy is delivered primarily in the HTTP Content-Security-Policy response header. The browser evaluates that policy before loading or executing many classes of content. You can restrict script execution, styles, images, fonts, frames, network connections, form submissions and embedded objects.
Free tools Windows power users keep installed
One-click scans. No signup required.
If an attacker injects markup into a page, a tight policy can prevent that markup from loading a remote script, opening a WebSocket to an unapproved host, posting a login form to an attacker’s server or embedding a legacy plugin. This reduces the capabilities available to the compromised page in each user’s browser.
#1 Best Overall
- [Ultra-Lightweight Ear Buds Designed for Small Ears] Each earbud weighs only 3.7g and features a compact, ergonomic in-ear design made especially for small ears. Secure, low-profile, and comfortable for workouts, all-day wear or overnight sleeping.The ultra-slim profile sits flush in your ear with no hard edges poking or rubbing, so you can even sleep on your side without discomfort.
- [Immersive Stereo Sound with TOZO OrigX Technology] TOZO OrigX tuning delivers clear vocals, balanced mids, and natural stereo sound for music, podcasts, and videos.
- [Long Battery Life for Daily Use] Get up to 7 hours of playtime on a single charge, with up to 32 hours total using the charging case—ideal for workdays, commuting, and extended listening sessions.
- [Bluetooth 5.3 & Stable Connection] Bluetooth 5.3 provides fast pairing, stable wireless performance, and reduced dropouts as you move around home or office.
- [Deep Bass with Clear Vocals] High-performance drivers produce punchy bass while keeping vocals clean and detailed for everyday listening.
CSP is not a server-side repair. A stolen administrator account, malicious server process, altered database record or vulnerable application remains compromised until you investigate and remediate it. Use CSP as a containment layer while you rotate credentials, remove unauthorized code, patch the underlying flaw and verify the deployment.
No authoritative source establishes a universal percentage reduction in harm from CSP after a compromise. Its value depends on the policy’s coverage, the browser, the application’s legitimate dependencies and whether the attacker can use an already-authorized origin.
A restrictive baseline policy
The following header expresses a deny-by-default posture while allowing same-origin resources and intentional inline scripts identified with a per-response nonce:
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsRank #2
- 【IP68 Waterproof Multifunctinal Smart Watch】Torjalph fitness activity tracker smart watch is IP68 waterproof technology ,you can wear it when swimming,handwashing,it's rain-proof which means that you perform multiple exercise modes outside without worrying about sweat or rain corroding your fitness smart watch,and this watch equipped with a 230 mAh large capacity battery magnetic charging ,and this sports activity tracker watch can be used 5-7 days If fully charged.
- 【Larger 1.83'' Full Screen Watch & Multi-dial Selection】1.83 inch full HD color touch screen smart watch for men / women provides excellent 240*284 resolution image quality ,This Bluetooth smart watch offers a better touch experience and remarkable immersion and ,more than 200 watch faces for you to choose from App"Da Fit ", you can change the dial style according to your mood to wear keeping the world on your wrist
- 【Accurate Activity Tracker Smart Watch 】sports watch activity tracker uses sweat and dust resistant breathable silicone strap, our Fitness Tracker Smart Watch for Android iOS Phones supports 12 sports modes,walking,running,bicycle,swimming,badminton,basketball,football,rope skipping. This bluetooth calls smart watch for men women is lightweight and stylish, bringing more convenient and relaxing sports experience while also providing more protection.
- 【Your 24 Hour Personal Daily Health Monitor】Fitness watch for women men full touch screen IP67 waterproof bluetooth smartwatch for Android iOS Phones with heart rate blood pressure monitor multifunction Andriod smart watch with steps counter sleep monitor sports fitness watch, monitoring blood oxygen saturation allows you to understand your physical condition in real time to track fitness progress ,to know your health status in time.
- 【More Functions Bluetooth Call Smart Watch】This fitness activity smart watch full screen for iPhone and Android phones includes a bunch of new features including:The bluetooth smart watch can hang up the phone, receive and display WhatsAPP /Text /Facebook /Twitter /Messenger reminder.Support sedentary reminder, alarm clock, stopwatch, timer,weather information,music control, remote camera control compatible with Android 5.0 and above or iOS 9.0 and above smartphones.
Content-Security-Policy: default-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'nonce-{per-request-random-value}'; style-src 'self'; img-src 'self' data:; font-src 'self'; connect-src 'self'; frame-src 'none'; report-to csp-endpoint; report-uri /csp-reportDo not copy this unchanged into every site. Replace or remove directives according to actual application behavior. Generate a fresh, unpredictable nonce for every response that contains nonce-authorized script, and place the same value on only the intended inline <script> elements. Never use a fixed nonce.
| Directive | What the baseline does | When to change it |
|---|---|---|
default-src |
Uses the same-origin set as the fallback for fetch directives. | Keep restrictive; override only a specific resource type that needs another origin. |
script-src |
Allows same-origin scripts and nonce-authorized inline scripts. | Add narrowly scoped origins, hashes or nonces for known code. Avoid broad keywords. |
connect-src |
Limits fetch, XHR, EventSource and WebSocket destinations to the site itself. | Add each required API or socket origin explicitly. |
object-src 'none' |
Disables plugin-style object and embed loads. | Change only if the application genuinely needs such content. |
base-uri 'none' |
Blocks attacker-controlled <base> elements. |
Use a narrow origin if the application deliberately relies on a base URL. |
form-action 'self' |
Allows forms to submit only back to the site. | List a specific payment, identity or other destination when required. |
frame-ancestors 'none' |
Prevents other origins from embedding the page. | Use a narrow allow-list for an approved portal, dashboard or integration. |
frame-src 'none' |
Prevents the page from loading child frames. | Add only the origins of required embedded content. |
style-src, img-src, font-src |
Allows same-origin styles, images from the site plus data:, and same-origin fonts. |
Add a specific CDN or asset host when inventory proves it is needed. |
report-to and report-uri |
Sends policy violations to a named reporting destination and a legacy-compatible path. | Configure a controlled collector and retain report-uri during browser-compatibility transition. |
How each control limits an attacker
default-src: establish the fallback
default-src 'self' supplies a restrictive fallback for fetch directives that you have not separately declared. It prevents an omitted directive from silently becoming permissive. Explicit directives still take precedence, so review every override rather than assuming the fallback covers it.
script-src: make code execution intentional
Scripts are usually the highest-impact capability in an injected page. script-src 'self' permits same-origin files, while a nonce authorizes only the inline blocks carrying that unpredictable value. A hash can authorize a specific inline block when its contents are stable. Both approaches are safer than allowing every inline script.
Rank #3
- [Low Noise High Fidelity] New bee guitar cord with 22AWG oxygen-free-copper center conductors provides enhanced signal transfer, the PVC insulation material and the high-density stranded copper double shield provide noise rejection for quiet operation
- [Ideal for Choice] New bee 1/4 straight and right angle metal connectors, ensures a secure connection in any instrument, pedal, or amp jack. L shape great fro on stage guitar stands
- [Wide Compatible] Suitable for mixer, power amplifier, microphone, effector, decoder, equalizer, electoronic organ, electric guitar, electric bass and other electronic equipments. Widely used in the installation of smart home, karaoke speaker, professional stage audio, etc
- [Easy Disassemble] Making incidental repairs quick and easy! Very nice, flexible cable
- [Dont Hesite to Order] 24 hours customer services and professional technology team are standing by
Avoid 'unsafe-inline' and 'unsafe-eval' unless a documented compatibility requirement leaves no alternative. 'unsafe-inline' broadly re-enables inline execution, and 'unsafe-eval' permits string-to-code evaluation patterns. If a legacy dependency needs one, isolate the exception, record why it exists and plan its removal.
connect-src: close common exfiltration paths
connect-src governs browser connections such as fetch and XHR requests, EventSource streams and WebSockets. Keeping it at 'self' blocks injected code from sending data directly to arbitrary domains. Add each legitimate API origin individually; do not replace the list with a broad wildcard merely to silence reports.
object-src and base-uri: remove legacy and URL-rewriting surprises
object-src 'none' disables plugin-style objects when the site has no business need for them. base-uri 'none' prevents an injected <base> element from changing how relative links and resource URLs resolve. These small directives eliminate attack surface that is easy to overlook because modern applications rarely use either feature intentionally.
Rank #4
- Digital Family Calendar: BSIMB digital calendar wall touch screen puts an end to your chaotic life. Designed for busy families, the digital calendar keeps you organised and in step with your family. Assign different colours and tasks to each family member to make family scheduling easier and more intuitive.
- Easy Setup and Auto-Sync: Plug in, connect to WLAN and auto-syn your electric calendar in minutes. Digital wall calendar compatible with Google calendar, iCloud calendar, Outlook calendar, Cozi calendar and Yahoo calendar. Add events directly on the device or through the ecalendar app. Electronic calendar stays current whether you're at work or traveling—no manual updates needed.
- All-In-One Home Assistant: Smart calendar builds habits and encourage independence with personalised chores. Display daily meal plan to reduce the daily ‘What's for dinner?’ stress. To-do lists keep track of everything you want. Turning chores into valuable achievements with stars and rewards, making life easier and more enjoyable.
- Manage Anytime Anywhere: BSIMB electronic calendar for family stay connected with the powerful ecalendar app. Access and manage your digital wall calendar anytime, anywhere with free features like stars & rewards, photo screensaver, chore charts, meals plans, to-do lists etc. Electronic planner paid features like Magic Import tailor advanced tools for users with special needs.
- Stay in Touch with Loved Ones: Share photos or videos from your phone to electronic wall calendar with app, instantly update your life moment, and keep in touch with your family, especially those who are far away; you can also surprise your smart calendar digital wall by sending him a wish card; it's also great for keeping tech-illiterate elders in touch with the youngsters.
form-action: protect credential and data submissions
form-action 'self' restricts where forms can submit. If checkout, identity or support workflows post to another origin, list only that exact destination. This control is separate from connect-src; allowing an API connection does not automatically authorize a form submission, and vice versa.
frame-ancestors versus frame-src
These directives protect opposite directions. frame-ancestors controls which origins may embed your page and is the CSP control for clickjacking exposure. frame-src controls which frames your page may load. A site can legitimately allow a child frame while refusing to be embedded itself, so configure them independently.
Styles, images and fonts
Keep style-src and font-src narrow because injected styles can alter user-visible controls and third-party assets expand trust. The baseline permits data: images to accommodate data-URL assets; retain that scheme only if the application uses it. Otherwise remove it and allow images from explicit origins.
Build the allow-list from the application, not from guesses
- Inventory every resource class. Record scripts, inline blocks, API calls, WebSockets, frames, fonts, images, styles and form destinations for authenticated and unauthenticated pages. Include error pages and administrative screens.
- Separate first-party and third-party origins. A vendor host used for analytics, payments or video should be listed only for the directive that needs it. An origin needed for images does not automatically belong in
script-srcorconnect-src. - Replace broad script exceptions. Add nonces for intentional per-response inline code or hashes for stable inline code. Remove dead scripts and inline event handlers instead of authorizing them wholesale.
- Document compatibility exceptions. If a framework requires an unsafe keyword, identify the affected pages, the reason, the owner and the removal plan. This turns a permanent blind spot into a tracked trade-off.
- Keep the policy readable. Group directives consistently, use one origin spelling, and review changes as security-sensitive configuration. A shorter policy is not automatically safer; an explicit, necessary origin is safer than an undocumented wildcard.
Roll out CSP without taking the site down
The W3C CSP specification says the Content-Security-Policy-Report-Only response header lets servers experiment by monitoring a policy rather than enforcing it. MDN likewise advises testing with that header before deploying an enforcing policy.
- Send report-only first. Return the proposed policy in
Content-Security-Policy-Report-Onlywhile the existing site continues to serve. Do not assume a quiet report stream means complete coverage; exercise important user journeys. - Collect reports at a controlled endpoint. Configure the named
report-togroup and a collector for/csp-report. Restrict access, rate-limit requests and avoid storing sensitive request data unnecessarily. Reports are input for tuning, not proof that every violation is malicious. - Remove noise and classify findings. Mark each report as required application behavior, obsolete dependency, deployment error or suspicious activity. Fix the application or narrow the policy rather than adding every reported host.
- Add nonces or hashes. Update templates so intentional inline code receives the response nonce, or hash stable blocks. Verify that the nonce is unpredictable and changes on each response.
- Enforce the reviewed policy. Switch to
Content-Security-Policyafter critical flows work under report-only. Keep reporting enabled so later regressions and newly introduced dependencies remain visible.
Maintain a short overlap in which report-only observations continue after enforcement. A deployment can pass a static review yet fail when a rarely used export, password-reset page or regional integration is exercised.
Reporting details and compatibility
report-to is the current reporting mechanism and requires a corresponding Reporting-Endpoints configuration that maps the group name, such as csp-endpoint, to your collector. Keep report-uri during a compatibility period when older browsers matter; it provides a fallback path for clients that do not implement the newer mechanism.
Recommended Free Tools
Protect the collector from becoming an attack surface. Accept reports without trusting their claimed origin, cap body size, discard or redact sensitive fields, and monitor spikes. A compromised page can generate large volumes of reports, so operational controls matter as much as the directive syntax.
Common breakages and precise fixes
| Symptom | Likely cause | Safer fix |
|---|---|---|
| Inline script is refused | The block has no nonce or matching hash. | Add a per-response nonce or a hash for stable code; do not add 'unsafe-inline' by default. |
| Framework feature reports an eval violation | A dependency constructs code from strings. | Upgrade or reconfigure the dependency; use 'unsafe-eval' only as a documented temporary exception. |
| API calls fail | The destination is absent from connect-src. |
Add the exact required API or WebSocket origin and retest authentication flows. |
| Embedded payment, video or identity frame is blank | The child origin is blocked by frame-src. |
Add that specific origin to frame-src; do not weaken frame-ancestors unless others must embed your page. |
| Form submission is blocked | The target is outside form-action 'self'. |
List the approved destination in form-action and verify the complete redirect flow. |
| Images or fonts disappear | The asset host or scheme is absent from its directive. | Allow the exact host in img-src or font-src; remove unused schemes such as data:. |
| Relative URLs behave unexpectedly | A required base URL conflicts with base-uri 'none'. |
Remove unnecessary <base> use or allow only the required base origin. |
How to compare two CSP designs
Do not judge policies by directive count alone. Compare them on the dimensions that determine containment:
Quick Recap
| Axis | Stronger design | Weaker design |
|---|---|---|
| Enforcement strength | Deny-by-default with narrowly scoped overrides. | Broad origins or a permissive fallback that authorizes unknown resources. |
| Script authorization | Nonces or hashes for intentional inline code. | 'unsafe-inline', unnecessary 'unsafe-eval' or unrestricted script hosts. |
| Outbound control | connect-src covers every approved API and socket destination only. |
Wildcard or broad connection permissions that leave easy exfiltration paths. |
| Embedding and navigation | Narrow frame-ancestors and form-action policies. |
Unrestricted embedding or forms that can post to arbitrary origins. |
| Legacy exposure | object-src 'none' where plugins are unnecessary. |
Unreviewed object and embed capabilities. |
| Operational readiness | Useful report collection, triage and regression monitoring. | Enforcement without visibility, or report endpoints that accept unlimited traffic. |
| Compatibility cost | Known exceptions tied to specific features and owners. | Permanent broadening to silence unexplained violations. |
Limitations to plan for
- CSP cannot stop server-side compromise, repair tampered content or revoke stolen credentials.
- An attacker who can modify trusted same-origin JavaScript may still abuse capabilities that the policy intentionally grants to that origin.
- Allowing a third-party origin for one resource class creates trust in that origin for that class; keep permissions separated by directive.
- Browser support and reporting behavior differ, which is why report-only testing and a temporary
report-urifallback are useful. - A policy that blocks legitimate business flows is likely to be disabled under pressure. Incremental rollout and documented exceptions preserve both security and availability.
Deployment checklist
- Set the policy as an HTTP response header on every relevant page, including authenticated areas.
- Start with
Content-Security-Policy-Report-Onlyand exercise real workflows. - Use
default-src 'self'or an equally restrictive fallback, then justify each override. - Use unpredictable per-response nonces or stable hashes instead of broad inline allowances.
- Constrain
connect-src,form-action,frame-srcandframe-ancestorsindependently. - Disable unused plugin objects with
object-src 'none'and prevent unauthorized base URL changes withbase-uri 'none'. - Configure
report-towithReporting-Endpoints; retainreport-uriwhile older browsers require it. - Review every new origin and every unsafe keyword as a security change.
- Continue incident response and credential rotation; CSP is containment, not remediation.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
