CVE-2025-27773CWE-347

SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding

High · published March 11, 2025

CVSS v3.1
8.6
EPSS
0%
Percentile
34.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00415 · 34.7th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2025-03-11T19:04Z
EPSS history
Timeline
  • 11 MAR 19:04Z
    SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding
    cvelistv5