CVE-2026-4636Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.
Updated under an hour ago ()
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It affects Red Hat build of Keycloak 26.2 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-551
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Keycloak 26.2 redhat:build_keycloak | from 26.2.15-1 not affected | CNA record |
Red Hat Red Hat build of Keycloak 26.2 redhat:build_keycloak | from 26.2.15-1 not affected | CISA ADP |
redhat build_of_keycloak redhat:build_of_keycloak | all versions; 26.2; 26.2.15; 26.4; 26.4.11 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:6475vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:6476vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:6477vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:6478vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-4636vdb-entry, x-refsource-redhat, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2450251issue-tracking, x-refsource-redhat, exploit, vendor-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4636.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.