{"id":"CVE-2026-50635","title":"LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it","summary":"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,…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-640"],"vendor":"LimeSurvey","product":"LimeSurvey","affected":["LimeSurvey <= 7.0"],"published":"2026-06-09","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:19.203","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50635","references":[{"url":"https://github.com/LimeSurvey/LimeSurvey/pull/5032","label":"disclosure@vulncheck.com"},{"url":"https://www.limesurvey.org/","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-09T18:20:43.192036Z"},"epss":0.00661,"epssPercentile":0.50063,"ingestedAt":"2026-10-08T16:52:14.685Z","slug":"CVE-2026-50635","body":"## Overview\n\nLimeSurvey 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}