CVE-2026-4636

HIGH EPSS 25.6%
Published Apr 2, 20262mo ago · Modified Jun 17, 20261w ago
8.1 CVSS 3.1
High
Find Similar
Published Apr 2, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.1
Exploitability
2.8
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
25.6% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-551

Affected Products 5

VendorProductVersionRange
redhatbuild_of_keycloak*any
redhatbuild_of_keycloak26.2any
redhatbuild_of_keycloak26.2.15any
redhatbuild_of_keycloak26.4any
redhatbuild_of_keycloak26.4.11any

References 6

  • access.redhat.com https://access.redhat.com/errata/RHSA-2026:6475
    Vendor Advisory
  • access.redhat.com https://access.redhat.com/errata/RHSA-2026:6476
    Vendor Advisory
  • access.redhat.com https://access.redhat.com/errata/RHSA-2026:6477
    Vendor Advisory
  • access.redhat.com https://access.redhat.com/errata/RHSA-2026:6478
    Vendor Advisory
  • access.redhat.com https://access.redhat.com/security/cve/CVE-2026-4636
    Vendor Advisory
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2450251
    ExploitIssue TrackingVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.