CVE-2026-49284

Summary

SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.

Affected Software

VendorProductVersion RangeStatus
simplesamlphpsimplesamlphp< 2.4.7affected
simplesamlphpsimplesamlphp>= 2.5.0-rc1, < 2.5.2affected

Weaknesses

  • CWE-345: CWE-345: Insufficient Verification of Data Authenticity

References