CVE-2025-27773 HIGH

CVE-2025-27773: SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding

Vendor Simplesamlphp
Product saml2
Weakness CWE-347
Published March 11, 2025
Last update May 9, 2025
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 11, 2025 CVE published
May 9, 2025 Record updated