Spring Security SAML2 Service Provider: Decryption Oracle Vulnerability from Unsigned SAML Response and Logout Payloads
Since Spring Security SAML decrypts SAML Responses as well as elements of SAML LogoutRequests and LogoutResponses without requiring a valid signature, attackers may be able to craft these SAML payloads and use the Service Provider as a decryption oracle. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-41694US | medium5.3 | — | ||
Since Spring Security SAML decrypts SAML Responses as well as elements of SAML LogoutRequests and LogoutResponses without requiring a valid signature, attackers may be able to craf… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/spring-projects/spring-securityPACKAGE
- https://github.com/spring-projects/spring-security/releases/tag/6.5.11WEB
- https://github.com/spring-projects/spring-security/releases/tag/7.0.6WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41694ADVISORY
- https://spring.io/security/cve-2026-41694WEB
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