Vulnerability record · CVE-2026-49284 · published 17 July 2026

CVE-2026-49284: Simplesamlphp insufficient verification of data authenticity vulnerability

SSimplesamlphp · Simplesamlphp

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.

7.1 CVSS 3.1 High EPSS 0.22% · top 88.5% CWE-345 · Insufficient verification of data authenticity

7.1CVSS 3.1 base score

0.22%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References

30 Jul 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

SSimplesamlphp Simplesamlphp

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-49284), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.