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.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.4.7	Product Release Notes
https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.5.2	Product Release Notes
https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:simplesamlphp:simplesamlphp::::::::
	cpe:2.3:a:simplesamlphp:simplesamlphp::::::::

History

No history.

Information

Published : 2026-07-17 20:17

Updated : 2026-07-30 13:39

NVD link : CVE-2026-49284

Mitre link : CVE-2026-49284

CVE.ORG link : CVE-2026-49284

JSON object : View

Products Affected

simplesamlphp

simplesamlphp

CWE

CWE-345

Insufficient Verification of Data Authenticity

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