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.
- Score
- CVSS 3.1 7.1 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-07-17
- Last modified
- 2026-07-20
- Weaknesses
- CWE-345
Affected products
References
- https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.4.7
- https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.5.2
- https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm
