CVE-2026-50635 – LimeSurvey Password Reset Host Header Injection Discloses Reset Token

CVE ID :CVE-2026-50635

Published : June 9, 2026, 6:17 p.m. | 19 minutes ago

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.

Severity: 8.8 | HIGH

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