CVE-2025-27773
High
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.
SeverityHigh
CVSS8.6
Exploit probability—
ProductSimplesamlphp/saml2
PublishedMar 11, 2025
First seenMar 11, 2025
Weakness typeCWE-347CWE-347
How to fix
Update
- simplesamlphp/saml24.17.0, 5.0.0-alpha.20 or later
- simplesamlphp/saml2-legacy4.17.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| simplesamlphp/saml2Packagist | v < 4.17.0, 5.0.0-alpha.1 ≤ v < 5.0.0-alpha.20 | 4.17.0, 5.0.0-alpha.20 |
| simplesamlphp/saml2-legacyPackagist | v < 4.17.0 | 4.17.0 |
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