CVE-2026-4636
Last modified
CVE-2026-4636 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | All versions |
| Redhat | Build Of Keycloak | 26.2 |
| Redhat | Build Of Keycloak | 26.2.15 |
| Redhat | Build Of Keycloak | 26.4 |
| Redhat | Build Of Keycloak | 26.4.11 |
References
- https://access.redhat.com/errata/RHSA-2026:6475Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6476Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6477Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6478Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-4636Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2450251Exploit, Issue Tracking, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6475Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6476Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6477Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6478Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-4636Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2450251Exploit, Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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