High severity8.6OSV Advisory· Published Mar 11, 2025· Updated Apr 15, 2026
CVE-2025-27773
CVE-2025-27773
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
simplesamlphp/saml2Packagist | < 4.17.0 | 4.17.0 |
simplesamlphp/saml2Packagist | >= 5.0.0-alpha.1, < 5.0.0-alpha.20 | 5.0.0-alpha.20 |
simplesamlphp/saml2-legacyPackagist | < 4.17.0 | 4.17.0 |
Affected products
3- Range: 1.5.3, 4.6.9, v0.1.0, …
- ghsa-coords2 versions
< 4.17.0+ 1 more
- (no CPE)range: < 4.17.0
- (no CPE)range: < 4.17.0
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-46r4-f8gj-xg56ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-27773ghsaADVISORY
- github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.phpnvdWEB
- github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.phpnvdWEB
- github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0nvdWEB
- github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56nvdWEB
- lists.debian.org/debian-lts-announce/2025/05/msg00013.htmlnvdWEB
News mentions
0No linked articles in our index yet.