{"id":"CVE-2025-27773","summary":"SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding","details":"The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.","aliases":["GHSA-46r4-f8gj-xg56"],"modified":"2026-08-12T03:30:35.270179307Z","published":"2025-03-11T19:04:52.135Z","database_specific":{"cwe_ids":["CWE-347"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27773.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113"},{"type":"WEB","url":"https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27773.json"},{"type":"ADVISORY","url":"https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27773"},{"type":"FIX","url":"https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/simplesamlphp/saml2","events":[{"introduced":"0"},{"introduced":"94d4c0736656b8fb7390cc6258b692f84ed5bae5"},{"fixed":"bdf16d1021363a0819c35806124a20e74a78c2c9"},{"fixed":"d35d41ba4b47b083b53d87fc541d5336c8743916"},{"fixed":"7867d6099dc7f31bed1ea10e5bea159c5623d2a0"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"4.17.0"},{"introduced":"5.0.0-alpha.1"},{"fixed":"5.0.0-alpha.20"}]}}],"versions":["v4.6.15","v5.0.0-alpha.19","v5.0.0-alpha.18","v4.6.14","v4.16.14","v4.6.13","v4.6.12","v5.0.0-alpha.17","v5.0.0-alpha.16","v4.6.11","v4.6.10","4.6.9","v4.6.8","v4.6.7","v4.6.6","v4.6.5","v4.6.4","v4.6.3","v4.6.2","v4.6.1","v4.6.0","v4.5.1","v4.5.0","v4.4.1","v4.4.0","v4.3.1","v4.3.0","v4.2.8","v4.2.7","v4.2.6","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0","v4.1.12","v4.1.11","v4.1.10","v4.1.9","v4.1.8","v4.1.7","v4.1.6","v4.1.5","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v3.4.0","v3.3.6","v3.3.5","v3.3.4","v3.3.3","v3.3.2","v3.3.0","v3.2.6","v3.2.5","v3.2.4","v3.2.3","v3.2.2","v3.2.1","v3.2","v3.1.6","v3.1.5","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v2.0.0","v1.7.1","v0.8.1","v1.7.0","v0.8.0","v1.6.1","v0.7.1","v1.6.0","v0.7.0","v1.5.4","v0.6.4","v1.5.3","v0.6.3","1.5.3","v1.5.2","v0.6.2","v1.5.1","v0.6.1","v1.5.0","v0.6.0","v1.4.0","v0.5.0","v1.3.2","v0.4.2","v1.3.1","v0.4.1","v1.3.0","v0.4.0","v1.2.0","v0.3.0","v1.1.0","v1.0.0","v0.1.0","v0.1.0-alpha"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-27773.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N"}]}