A password-reset form with weak abuse controls can let anyone repeatedly trigger reset emails to someone else’s address. The sender is not paying to deliver each message; the site is doing the sending. OWASP warns that automated requests can flood a person’s email inbox or phone, making recovery endpoints security-sensitive—not harmless forms.
How a password-reset form becomes an email cannon
An attacker enters a target’s email address on a site’s “Forgot password?” page and submits the form repeatedly. If each submission triggers a message and the endpoint lacks effective protections, the target can receive a stream of unwanted reset links. The operator—not the attacker—bears the delivery and abuse burden.
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OWASP illustrates the risk with a hypothetical scenario: without protections against excessive automated submissions, an attacker could make thousands of requests per hour for one account and flood its email or SMS intake. That is an example in OWASP guidance, not a measured attack rate or a claim about how often this happens.
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This describes a risk condition, not a finding that every password-reset form is vulnerable. Whether a particular service can be abused depends on its controls and implementation.
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What a secure recovery flow should do
Limit repeated requests without blocking legitimate recovery
Use controls such as per-account rate limiting, CAPTCHA, or other protections against automated submissions. OWASP recommends these measures but does not prescribe a universal request threshold. Operators need to set limits and friction appropriate to their service, while considering how controls could obstruct a legitimate user trying to recover an account.
Account lockout deserves particular care: it can deter abuse, but it can also stop the rightful user from recovering access. Treat the recovery path as a usability and security decision, not simply a matter of making the limit as strict as possible.
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Keep responses neutral
The request page should not tell an outsider whether an address has an account. Use the same message for existing and nonexistent accounts, and keep response timing consistent enough that the flow does not reveal account existence. Otherwise, the form can become an account-enumeration tool as well as a way to trigger email.
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Rate limits control repeated requests, but they do not secure the reset process itself. OWASP advises using HTTPS, avoiding reset URLs built from an untrusted Host header, protecting tokens against brute-force attempts, and preventing token leakage through referrer information. Reset links should be time limited and single use.
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Do not change the password on request alone
A reset request is not proof that the account owner wants to change the password. Change it only after the user completes the confirmation flow. Changing it as soon as someone submits the form could lock out the legitimate user and turn repeated requests into a denial-of-service mechanism.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do if someone keeps requesting reset emails
If you received the messages
Repeated reset emails do not by themselves establish that someone has accessed your account; they can result from repeated requests to the recovery form. Do not follow a link unless you initiated the reset and trust the message. If you are concerned, visit the service through its usual app or by typing its address yourself, check the account’s security settings, and contact the service through its official support channel.
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If you operate the site
- Review whether repeated submissions can trigger repeated deliveries, including requests distributed across automated clients.
- Add request-abuse controls, choosing thresholds and friction with legitimate recovery and lockout risks in mind.
- Check that messages and timing do not disclose whether an account exists.
- Verify HTTPS, trusted reset-URL construction, token protections, link expiry, and single-use behavior.
- Ensure a request alone never changes the account password.
OWASP’s Forgot Password Cheat Sheet covers recovery-flow protections. Its Web Security Testing Guide discusses testing weak password-change and reset functionality, including automated abuse and lockout considerations.
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