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CVE-2026-49284

SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo` PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
simplesamlphp / simplesamlphpaffected < 2.4.7; affected >= 2.5.0-rc1, < 2.5.2

CWE

CWE-345

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.