CVE-2025-27773
simplesamlphp - security update
8.6
HIGH
CVSS 3.1
EPSS 0.16%
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.
How to fix CVE-2025-27773
To remediate CVE-2025-27773, upgrade the affected package to a fixed version below.
- —upgrade to 1.19.0-1+deb11u2 or later
- —upgrade to 1.19.0-1+deb11u2 or later
- —upgrade to 4.17.0 or later
- —upgrade to 4.17.0 or later
Is CVE-2025-27773 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.19.0-1+deb11u2
- from 0, < 1.19.0-1+deb11u2
- from 0, < 4.17.0
- from 0, < 4.17.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N |