CVE-2025-27773

NameCVE-2025-27773
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1100595

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
simplesamlphp (PTS)bullseye1.19.0-1vulnerable
bullseye (security)1.19.0-1+deb11u1vulnerable
sid, bookworm, bookworm (security)1.19.7-1+deb12u1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
simplesamlphpsource(unstable)(unfixed)1100595

Notes

https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56
https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0
SimpleSAMLphp SAML2 library embedded in simplesamlphp
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