CVE-2026-49284
SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 3.1
- 7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345
- Affected
- simplesamlphp/simplesamlphp
- Source
- security-advisories@github.com
References
- https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.4.7Product, Release Notes
- https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.5.2Product, Release Notes
- https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrmVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.