High severity7.1OSV Advisory· Published Jul 17, 2026· Updated Jul 30, 2026
CVE-2026-49284
CVE-2026-49284
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
simplesamlphp/simplesamlphpPackagist | >= 2.5.0, < 2.5.2 | 2.5.2 |
simplesamlphp/simplesamlphpPackagist | < 2.4.7 | 2.4.7 |
Affected products
3cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:*range: <2.4.7
- (no CPE)range: <1.18.6, <2.4.7, <2.5.2
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-q8r6-xj3f-wrrmghsaADVISORY
- github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrmnvdVendor AdvisoryWEB
- github.com/simplesamlphp/simplesamlphp/releases/tag/v2.4.7nvdProductRelease Notes
- github.com/simplesamlphp/simplesamlphp/releases/tag/v2.5.2nvdProductRelease Notes
News mentions
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