Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-49284

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 4.9%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2026-49284


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