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Description

A flaw was found in Keycloak. Keycloak's Security Assertion Markup Language (SAML) broker endpoint does not properly validate encrypted assertions when the overall SAML response is not signed. An attacker with a valid signed SAML assertion can exploit this by crafting a malicious SAML response. This allows the attacker to inject an encrypted assertion for an arbitrary principal, leading to unauthorized access and potential information disclosure.

PUBLISHED Reserved 2026-02-06 | Published 2026-03-18 | Updated 2026-03-18 | Assigner redhat




HIGH: 7.7CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

Problem types

Improper Validation of Specified Type of Input

Product status

Default status
affected

26.2.14-1 (rpm) before *
unaffected

Default status
affected

26.2-16 (rpm) before *
unaffected

Default status
affected

26.2-16 (rpm) before *
unaffected

Default status
unaffected

Default status
affected

26.4.10-1 (rpm) before *
unaffected

Default status
affected

26.4-12 (rpm) before *
unaffected

Default status
affected

26.4-12 (rpm) before *
unaffected

Default status
unaffected

Timeline

2026-02-06:Reported to Red Hat.
2026-03-05:Made public.

Credits

Red Hat would like to thank Oleh Konko for reporting this issue.

References

access.redhat.com/errata/RHSA-2026:3925 (RHSA-2026:3925) vendor-advisory

access.redhat.com/errata/RHSA-2026:3926 (RHSA-2026:3926) vendor-advisory

access.redhat.com/errata/RHSA-2026:3947 (RHSA-2026:3947) vendor-advisory

access.redhat.com/errata/RHSA-2026:3948 (RHSA-2026:3948) vendor-advisory

access.redhat.com/security/cve/CVE-2026-2092 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2437296 (RHBZ#2437296) issue-tracking

cve.org (CVE-2026-2092)

nvd.nist.gov (CVE-2026-2092)

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