SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding (simplesamlphp saml2)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.41 % · percentile 36 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Deferred
Description
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.
Weaknesses (CWE)
- CWE-347 — Improper Verification of Cryptographic Signature
References
- https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56
- https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0
- https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113
- https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217
- https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N | GitHub_M |
| CVSS 3.1 | HIGH 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-46r4-f8gj-xg56 — The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding
European references
- ENISA EUVD · EUVD-2025-7804
- GCVE · GCVE-0-2025-27773
CERT-FR advisories
- CERTFR-2025-AVI-0836 — Multiples vulnérabilités dans les produits Tenable · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| simplesamlphp · saml2 | affected < 4.17.0 ; affected >= 5.0.0-alpha.1, < 5.0.0-alpha.20 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |