Vulnerability in Simplesamlphp Saml2

CVE-2025-27773

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…

EPSS: 0.003 (21.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-27773?
CVE-2025-27773 is a high-severity vulnerability in Simplesamlphp Saml2, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.6/10. Published 2025-03-11.
How severe is CVE-2025-27773?
High severity. CVSS v3 base score is 8.6 out of 10.
Is CVE-2025-27773 known to be exploited?
3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.