Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/LimeSurvey/LimeSurvey/pull/5032
- https://www.limesurvey.org/
- https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injec
FAQ
What is CVE-2026-50635?
CVE-2026-50635 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 de...
How severe is CVE-2026-50635?
CVE-2026-50635 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-50635?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.