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Vulnerabilities

Vulnerability · CVE-2026-4636

A flaw was found in Keycloak.

Published Apr 2, 2026 · catalog updated Jul 15, 2026 · build of keycloak

Check if you run it

No confirmed exploitation is on record for CVE-2026-4636. EPSS is 0.48%. Act only if a listed version of build of keycloak is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Advisory link
Affected products
cpe redhat/build of keycloak

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/build of keycloak26.2
  • cpe redhat/build of keycloak26.2.15
  • cpe redhat/build of keycloak26.4
  • cpe redhat/build of keycloak26.4.11

How to fix CVE-2026-4636

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4636. EPSS is 0.48%. Act only if a listed version of build of keycloak is installed.

Which versions are affected?

Compare what you have installed with 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. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-551. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 2, 2026 · NIST NVD

    Detected

    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 th

  2. Jul 15, 2026 · NIST NVD

    Updated

    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 th

Sources

  • CVE.orgVulnerability recordCVE-2026-4636

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4636

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-4636

    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 a

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.