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CVE-2025-27773

Date: March 11, 2025

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.

Severity Score

Related Resources (9)

https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217
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://security-tracker.debian.org/tracker/CVE-2025-27773
https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html
https://nvd.nist.gov/vuln/detail/CVE-2025-27773
https://github.com/simplesamlphp/saml2
https://www.mend.io/vulnerability-database/CVE-2025-27773

Severity Score

Weakness Type (CWE)

Improper Verification of Cryptographic Signature

CWE-347

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

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