CVE-2025-27773

HIGH EPSS 21.3%
Published Mar 11, 20251y ago · Modified Jun 17, 20262w ago
8.6 CVSS 3.1
High
Find Similar
Published Mar 11, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.6
Exploitability
3.9
Impact
4.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
21.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-347

References 5

  • github.com https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113
  • github.com https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217
  • github.com https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0
  • github.com https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.