Improper Verification of Cryptographic Signature Affecting simplesamlphp/saml2-legacy package, versions <4.17.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-SIMPLESAMLPHPSAML2LEGACY-9406867
- published14 Mar 2025
- disclosed11 Mar 2025
- creditahacker1-securesaml
Introduced: 11 Mar 2025
CVE-2025-27773 (opens in a new tab)How to fix?
Upgrade simplesamlphp/saml2-legacy to version 4.17.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature through the HTTPRedirect binding process. An attacker can manipulate the message processing by appending a malicious SAMLRequest in front of a valid SAMLResponse, leading to the application processing an unsigned or altered message as if it were valid.