CVE-2025-27773
HIGHSimpleSAMLphp saml2 < 4.17.0 and 5.0.0-alpha.1-5.0.0-alpha.20 - Signature Confusion Attack via HTTPRedirect Binding
Title source: llmDescription
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.
References (5)
Core 5
Core References
Vendor Advisory x_refsource_confirm
https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56
Patch x_refsource_misc
https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0
Various Sources x_refsource_misc
https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113
Scores
CVSS v3
8.6
EPSS
0.0030
EPSS Percentile
21.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-347
Status
published
Products (4)
simplesamlphp/saml2
0 - 4.17.0Packagist
simplesamlphp/saml2
< 4.17.0
simplesamlphp/saml2
>= 5.0.0-alpha.1, < 5.0.0-alpha.20
simplesamlphp/saml2-legacy
0 - 4.17.0Packagist
Published
Mar 11, 2025
Tracked Since
Feb 18, 2026