Web page hijacking is unauthorized control or alteration affecting a web page or the domain that serves it. The phrase is used loosely. It can mean malicious code or pages injected into a website that someone else controls, or it can mean unauthorized control over a domain’s registration or DNS. These are different layers of the same web presence, and confusing them is the most common source of mistakes when someone reports or investigates an incident.
What the term covers
There is no single formal definition of “web page hijacking.” Two usages appear in authoritative sources, and the article’s meaning depends on which one a writer intends.
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- Hacked content on a site. Google uses the term “hacked content” for unauthorized material placed on a website, including injected code and spammy pages added without the owner’s consent. This is the sense most people mean when a page suddenly shows gambling links, fake login forms, or redirects.
- Domain-registration hijacking. ICANN’s terminology page defines domain name registration hijacking as “A form of Domain Name System (DNS) abuse in which a cyberattacker gains control over how a registered domain name is resolved.” The phrase is often used loosely for this as well.
ICANN’s Security and Stability Advisory Committee report SAC 007, published on 12 July 2005, offers a broader framing: “Domain hijacking refers to the wrongful taking of control of a domain name from the rightful name holder.”
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The clearest way to separate the meanings is by the layer that was compromised. The table below compares the three situations people most often describe as “hijacking.”
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| Situation | What the attacker controls | Usual term | Who has to act first |
|---|---|---|---|
| Site content compromise | Files, pages, or scripts served by the website, usually through a flaw in the site or its software | Hacked content; injected code or pages | The site owner, developer, or hosting provider |
| Domain registration or DNS takeover | The registrar account, the authoritative name servers, or how the domain resolves | Domain (registration) hijacking | The registrant, working with the registrar or DNS provider |
| Subdomain takeover | A subdomain whose DNS record points to a resource that has been removed | Subdomain takeover | The organization that owns the DNS record |
A useful diagnostic: if the domain’s DNS and registrar records look unchanged but visitors see injected content or redirects, the problem is most likely on the site itself. If the domain resolves to an unexpected destination, or the registration details have changed without the owner’s action, the problem is at the registration or DNS layer.
How page content gets hijacked
Exploiting a site vulnerability
Content compromise usually starts with a security flaw in the website, its content management system, a plugin, or a server configuration. Once an attacker can write to the site, the rest of the attack depends on what they want visitors to see.
Injected scripts and iframes
Attackers often add malicious JavaScript or hidden iframes to existing pages. The site’s own URLs stay the same, which is why the change may go unnoticed for some time.
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Added spam or malicious pages
Another pattern is creating new pages, often in unrelated sections of the site, that promote spam or host malicious content. Search engines may index these pages under the legitimate domain.
Cloaking and selective redirects
Google’s spam policies describe cloaking, in which a compromised site shows normal content to the site owner or to some visitors while other visitors see redirects or spam. Mobile users are a common target, which means a site owner checking the page on a desktop browser may see nothing wrong.
How domain-level hijacking happens
CISA’s adversary technique reference for domains (T1584.001) lists several routes into a domain’s control. The common thread is that the attacker gets into the process that manages the domain, not the website itself.
Registrar account compromise
An attacker who controls the registrant’s account at the registrar can change the name servers, alter DNS settings, or transfer the domain to another registrar. CISA identifies compromised owner email as one way into these accounts.
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CISA also lists social engineering of a registrar’s help desk and weaknesses in the renewal process as possible routes. A domain can be taken over through a convincing support request or during a renewal step that lacks adequate verification.
Compromised management services
A cloud service used to manage domains or DNS can itself become the entry point. Control of that service can allow changes to every record it hosts.
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Dangling DNS records and subdomain takeover
An organization may leave a DNS record pointing to a cloud resource or service that has since been deleted. If that resource name becomes available to another party, the attacker can claim it and serve content from what appears to be the organization’s own subdomain. CISA lists this as a distinct route.
What visitors and owners may notice
The SSAC report from 2005 describes the potential consequences of domain hijacking: website defacement, email disruption or theft, phishing, traffic inspection, and damage to a registrant’s business and reputation. These are possible outcomes, not a description of every incident. Not every hijacking produces all of them, and the report predates much of the current spam and content-injection activity described above.
In practice, owners typically notice one of four things: a page showing content they did not publish, visitors being sent to a different site, an email system that stops working or behaves strangely, or a registrar notification about a change they did not make.
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Prevention: what the sources support
Two sources give concrete prevention guidance. Both should be read with their dates in mind.
- Registrar lock and transfer controls. The 2005 SSAC report says consistent use of registrar lock, EPP authorization information, and notification of pending transfers can prevent some hijacking incidents. It does not guarantee protection, and it is not a complete current checklist.
- Securing the account chain. CISA’s guidance points to protecting the registrar account together with its associated email address and any management services used to change domain settings. Because account recovery often runs through email, weak email security weakens the domain.
- Auditing DNS records. Removing records that point to deprovisioned cloud resources closes the subdomain takeover route.
If you suspect a hacked page or hijacked domain
- Secure the registrar, hosting, and email accounts first. Change passwords, enable multi-factor authentication where offered, and review recent account activity.
- Check the domain’s current name servers and DNS records against what you expect. Look for records pointing to services you no longer use.
- Inspect the site for injected scripts, hidden iframes, and unfamiliar pages, and check how it appears on a mobile device as well as a desktop, since cloaking can hide the problem.
- Remove the injected material, update the software that was exploited, and confirm the fix from a clean browser session.
- Report the problem to Google through its spam, phishing, or malware reporting routes if the content is affecting search results. Google’s guidance, last updated 4 February 2025, says reports do not directly lead to action against a specific violation, but they help improve the systems that protect search results. Reporting does not clean up your site, so the steps above still come first.
Reports about the registration layer go to the registrar or DNS provider, not to a search platform, because that party can actually change the domain’s configuration.
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