{"id":"CVE-2026-40080","summary":"Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect","details":"Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Open Redirect through a substring check rather than a host check at str_contains($referer, CACTI_PATH_URL). When the user's login_opts == '1' (redirect to referer after login), the function used $_SERVER['HTTP_REFERER'] directly.  An attacker could craft a referer such as https://evil.com/cacti/. Where CACTI_PATH_URL is /cacti/, the substring matches and the user is redirected to evil.com after login. The pre-existing validate_redirect_url() helper at lib/html_utility.php performed proper validation but was not invoked from auth_login_redirect(). This issue has been fixed in version 1.2.31.","aliases":["GHSA-6gr7-53g8-vchq"],"modified":"2026-07-08T08:13:12.528439430Z","published":"2026-06-25T22:29:51.784Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40080.json","cwe_ids":["CWE-601"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40080.json"},{"type":"ADVISORY","url":"https://github.com/Cacti/cacti/security/advisories/GHSA-6gr7-53g8-vchq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40080"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cacti/cacti","events":[{"introduced":"0"},{"fixed":"1e8eaca26b84b128c39ce8cc8ece42d7ff76aac1"}],"database_specific":{"cpe":"cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*","source":["AFFECTED_FIELD","CPE_RANGE"],"extracted_events":[{"introduced":"0"},{"fixed":"1.2.31"}]}}],"versions":["release/1.2.30","release/1.2.29","release/1.2.28","release/1.2.27","release/1.2.26","release/1.2.25","release/1.2.24","release/1.2.23","release/1.2.22","release/1.2.21","release/1.2.20","release/1.2.19","releaes/1.2.19","release/1.2.18","release/1.2.17","release/1.2.16","release/1.2.15","release/1.2.14","release/1.2.13","release/1.2.12","release/1.2.11","release/1.2.10","release/1.2.9","release/1.2.8","release/1.2.7","release/1.2.6","release/1.2.5","release/1.2.4","release/1.2.3","release/1.2.2","release/1.2.1","release/1.2.0","release/1.1.38","release/1.1.37","release/1.1.36","release/1.1.35","release/1.1.34","release/1.1.33","release/1.1.32","release/1.1.31","release/1.1.30","release/1.1.29","release/1.1.28","release/1.1.27","release/1.1.26","release/1.1.25","release/1.1.24","release/1.1.23","release/1.1.22","release/1.1.21","release/1.1.20","release/1.1.19","release/1.1.18","release/1.1.17","release/1.1.16","release/1.1.15","release/1.1.14","release/1.1.13","release/1.1.12","release/1.1.11","release/1.1.8","release/1.1.7","release/1.1.6","release/1.1.5","release/1.1.4","release/1.1.3","release/1.1.2","release/1.1.1","release/1.1.0","release/1.0.6","release/1.0.5","release/1.0.4","release/1.0.3","release/1.0.2","release/1.0.1","release/1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40080.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}