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CVE-2026-4636

8.1 · HIGH

A flaw was found in Keycloak.

Published Apr 2, 2026CWE-551EPSS 0.48%

Overview

CVE-2026-4636 is a high-severity vulnerability. It was published on April 2, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:6475Refaccess.redhat.com/errata/RHSA-2026:6476Refaccess.redhat.com/errata/RHSA-2026:6477Refaccess.redhat.com/errata/RHSA-2026:6478Refaccess.redhat.com/security/cve/CVE-2026-4636Refbugzilla.redhat.com/show_bug.cgi?id=2450251Refaccess.redhat.com/errata/RHSA-2026:6475Refaccess.redhat.com/errata/RHSA-2026:6476Refaccess.redhat.com/errata/RHSA-2026:6477Refaccess.redhat.com/errata/RHSA-2026:6478

How CyberStrike helps

Frequently asked questions

What is CVE-2026-4636?

CVE-2026-4636 is a high-severity vulnerability. It was published on April 2, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-4636?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-4636?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-4636?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-4636 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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