8.1
High
CVE-2026-4636 A flaw was found in Keycloak
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Build of Keycloak | Versions not published | |
| Red Hat build of Keycloak 26.4 26.4 | earliest → < 26.4-14 | 26.4-14 |
| Red Hat build of Keycloak 26.4.11 | Versions not published | |
| Red Hat build of Keycloak 26.2 26.2 | earliest → < 26.2-18 | 26.2-18 |
| Red Hat build of Keycloak 26.2.15 | Versions not published |
References
- RHSA-2026:6475 access.redhat.com
- RHSA-2026:6476 access.redhat.com
- RHSA-2026:6477 access.redhat.com
- RHSA-2026:6478 access.redhat.com
- access.redhat.com access.redhat.com
- RHBZ#2450251 bugzilla.redhat.com
Timeline
- Published
- Last modified
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