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
- Simplesamlphp Saml2 — versions < 4.17.0, >= 5.0.0-alpha.1, < 5.0.0-alpha.20
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- af854a3a-2127-422b-91ae-364da2661108
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.