CVE catalog

CVE-2025-27773

SimpleSAMLphp vulnerabilities

[CVE catalog]

Severity
Medium
Published
Source
[NVD] · [CVE record]
EPSS
0.41% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiansimplesamlphpsid2.5.3.1-1fixed
Debiansimplesamlphpforky2.5.3.1-1fixed
Debiansimplesamlphpbookworm1.19.7-1+deb12u2fixed
Debiansimplesamlphpbookworm-security1.19.7-1+deb12u1vulnerable
Ubuntusimplesamlphpnoble1.19.7-1+deb12u1ubuntu0.1fixed
Ubuntusimplesamlphppro1.19.1-1vulnerable
Ubuntusimplesamlphppro1.19.1-1.1vulnerable
Ubuntusimplesamlphppro1.19.1-1.1ubuntu0.1~esm1fixed
Ubuntusimplesamlphp24.041.19.7-1vulnerable
Ubuntusimplesamlphp24.041.19.7-1+deb12u1ubuntu0.1fixed
Ubuntusimplesamlphp25.101.19.7-1+deb12u1vulnerable
Ubuntusimplesamlphp25.101.19.7-2vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiansimplesamlphpsourcesid1.19.7-2not yet assignedNot reported[1100595]
Debiansimplesamlphpsourceforky1.19.7-2not yet assignedNot reported[1100595]
Debiansimplesamlphpsourcebookworm1.19.7-1+deb12u2not yet assignedNot reported[1100595]
Ubuntusimplesamlphpdebnoble1.19.7-1+deb12u1ubuntu0.1Not reportedNot reportedNot reported
Ubuntusimplesamlphpdebpro1.19.1-1.1ubuntu0.1~esm1Not reportedUBUNTU-CVE-2025-27773Not reported
Ubuntusimplesamlphpdeb24.041.19.7-1+deb12u1ubuntu0.1Not reportedUBUNTU-CVE-2025-27773Not reported

[Debian bug #1100595]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [simplesamlphp]Affected
    Details (4)

    • 1.19.7-1+deb12u2 · all · bookworm

      Fixed · Fixed: 1.19.7-1+deb12u2

      usn · simplesamlphp · debian · bookworm; usn · simplesamlphp · debian · 12

    • 1.19.7-1+deb12u2 · all · bookworm

      Fixed · Fixed: 1.19.7-1+deb12u2

      usn · simplesamlphp · debian · bookworm; usn · simplesamlphp · debian · 12

    • 1.19.7-1+deb12u1 · all · bookworm-security

      Affected · Fixed: 1.19.7-1+deb12u2

      usn · simplesamlphp · debian · bookworm; usn · simplesamlphp · debian · 12

    • 1.19.7-1+deb12u1 · all · bookworm-security

      Affected · Fixed: 1.19.7-1+deb12u2

      usn · simplesamlphp · debian · bookworm; usn · simplesamlphp · debian · 12

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Ubuntu Security Notices (USN)]