GHSA-f2hx-5fx3-hmcv
Keycloak: UMA Policy Resource Injection Allows Unauthorized Cross-User Permission Grants
At a glance
- Published
- Updated
- CVE
- CVE-2026-4636
- Aliases
- BIT-keycloak-2026-4636
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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 packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-services | introduced 0, fixed 26.5.7 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-4636 ADVISORY
- https://github.com/keycloak/keycloak/issues/47717 WEB
- https://github.com/keycloak/keycloak/commit/995832f8b74b02833d106c8788bb7a78634aa725 WEB
- https://access.redhat.com/errata/RHSA-2026:6475 WEB
- https://access.redhat.com/errata/RHSA-2026:6476 WEB
- https://access.redhat.com/errata/RHSA-2026:6477 WEB
- https://access.redhat.com/errata/RHSA-2026:6478 WEB
- https://access.redhat.com/security/cve/CVE-2026-4636 WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2450251 WEB
- https://github.com/keycloak/keycloak PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |