What’s Vulnerable › Vulnerabilities
CVE-2026-50635: LimeSurvey Password Reset Host Header Injection Discloses Reset Token
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-09 · updated 2026-10-08
- Weakness: CWE-640
Description
LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.
Affected products
- LimeSurvey: through 7.0
References
- https://github.com/LimeSurvey/LimeSurvey/pull/5032
- https://www.limesurvey.org/
- https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token
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