{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-50635: LimeSurvey Password Reset Host Header Injection Discloses Reset Token","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-50635","status":"final","version":"1","initial_release_date":"2026-06-09T17:34:30.992Z","current_release_date":"2026-06-10T22:46:42.371Z","revision_history":[{"date":"2026-06-09T17:34:30.992Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-50635 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-50635"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-50635"},{"category":"external","summary":"GitHub Pull Request 5032","url":"https://github.com/LimeSurvey/LimeSurvey/pull/5032"},{"category":"external","summary":"Official Product Homepage","url":"https://www.limesurvey.org/"},{"category":"external","summary":"VulnCheck Advisory: LimeSurvey Password Reset Host Header Injection Discloses Reset Token","url":"https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token"}]},"product_tree":{"branches":[{"category":"vendor","name":"LimeSurvey","branches":[{"category":"product_name","name":"LimeSurvey","branches":[{"category":"product_version_range","name":"<=7.0","product":{"name":"LimeSurvey LimeSurvey <=7.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:limesurvey:limesurvey:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"7.0.1","product":{"name":"LimeSurvey LimeSurvey 7.0.1","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:limesurvey:limesurvey:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-50635","title":"LimeSurvey Password Reset Host Header Injection Discloses Reset Token","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"],"fixed":["CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","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","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 7.0.1.","product_ids":["CSAFPID-1"],"url":"https://github.com/LimeSurvey/LimeSurvey/pull/5032"}]}]}