{"id":"CVE-2026-50635","state":"PUBLISHED","title":"LimeSurvey Password Reset Host Header Injection Discloses Reset Token","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.","publishedAt":"2026-06-09T17:34:30.992Z","updatedAt":"2026-10-08T15:23:04.456Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["LimeSurvey LimeSurvey"],"affected":[{"vendor":"LimeSurvey","product":"LimeSurvey","packageURL":"pkg:composer/limesurvey/limesurvey","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.0","versionType":"custom"},{"version":"7.0.1","status":"unaffected","versionType":"custom"}]}],"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"],"weaknesses":["CWE-640"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/50xxx/CVE-2026-50635.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-50635","state":"PUBLISHED","datePublished":"2026-06-09T17:34:30.992Z","dateUpdated":"2026-10-08T15:23:04.456Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-06-05T11:53:55.168Z"},"containers":{"cna":{"title":"LimeSurvey Password Reset Host Header Injection Discloses Reset Token","descriptions":[{"lang":"en","value":"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":[{"vendor":"LimeSurvey","product":"LimeSurvey","packageURL":"pkg:composer/limesurvey/limesurvey","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.0","versionType":"custom"},{"version":"7.0.1","status":"unaffected","versionType":"custom"}]}],"references":[{"url":"https://github.com/LimeSurvey/LimeSurvey/pull/5032","name":"GitHub Pull Request 5032","tags":["issue-tracking"]},{"url":"https://www.limesurvey.org/","name":"Official Product Homepage","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token","name":"VulnCheck Advisory: LimeSurvey Password Reset Host Header Injection Discloses Reset Token","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","version":"3.1","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-640","lang":"en","description":"Weak Password Recovery Mechanism for Forgotten Password","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-08T15:23:04.456Z"},"datePublic":"2026-06-09T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:limesurvey:limesurvey:*:*:*:*:*:*:*:*","versionEndIncluding":"7.0"}]}]}],"credits":[{"lang":"en","value":"McCaulay Hudson (@_McCaulay) of watchTowr","type":"finder"}],"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-09T18:20:43.192036Z","id":"CVE-2026-50635","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-09T18:22:43.787Z"}}]}}}