{"id":"CVE-2026-50635","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-50635","summary":"LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it.","details":"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.","published":"2026-06-09T18:31:04Z","modified":"2026-07-31T19:30:46.551024624Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00372,"percentile":0.29982,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"limesurvey/limesurvey","fixedVersion":null}],"fix":{"url":"https://github.com/LimeSurvey/LimeSurvey/pull/5032","label":"LimeSurvey/LimeSurvey#5032"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50635"},{"type":"WEB","url":"https://github.com/LimeSurvey/LimeSurvey/pull/5032"},{"type":"WEB","url":"https://github.com/LimeSurvey/LimeSurvey/commit/ac2a4f1673de7b56e7a342c338f36e8bb077d4b3"},{"type":"WEB","url":"https://github.com/LimeSurvey/LimeSurvey/commit/b394cb64328aa6db95e3304f82c8c9e603e9ceb0"},{"type":"PACKAGE","url":"https://github.com/LimeSurvey/LimeSurvey"},{"type":"WEB","url":"https://www.limesurvey.org"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T19:30:46.551024624Z"}}