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Vulnerabilities

Vulnerability · CVE-2026-9799

Keycloak allows unauthorized access to resources via uma permission ticket bypass

Published Aug 25, 2026 · catalog updated Oct 29, 2026 · Keycloak allows unauthorized access

Last checked Oct 31, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-9799. EPSS is 0.29%. Act only if a listed version of Keycloak allows unauthorized access is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Keycloak allows unauthorized access).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Version ranges on file
Affected products
Bitnami keycloak · Maven org.keycloak:keycloak-services · maven org.keycloak · maven org.keycloak:keycloak-services

### Description A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type. The primary consequence is unauthorized information disclosure or modification of resources.

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.

  • Bitnami keycloak26.4.0 → 26.4.13
  • Maven org.keycloak:keycloak-services0 → 26.6.4
  • maven org.keycloakversion unspecified
  • maven org.keycloak:keycloak-services< 26.6.4

How to fix CVE-2026-9799

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-2026-9799. EPSS is 0.29%. Act only if a listed version of Keycloak allows unauthorized access is installed.

Which versions are affected?

Compare what you have installed with 26.4.0 → 26.4.13, 0 → 26.6.4, < 26.6.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-639: Authorization Bypass Through User-Controlled Key. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Keycloak security

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Oct 29, 2026 · GitHub Advisory Database

    Detected

    ### Description A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have

  2. Oct 29, 2026 · GitHub Advisory Database

    Fix available

    org.keycloak:keycloak-services fixed in 26.6.4

  3. Oct 29, 2026 · GitHub Advisory Database

    Fix available

    org.keycloak:keycloak-services fixed in 26.6.4

  4. Oct 29, 2026 · GitHub Advisory Database

    Fix available

    keycloak fixed in 26.4.13

  5. Oct 29, 2026 · GitHub Advisory Database

    Fix available

    keycloak fixed in 26.4.13

  6. Oct 29, 2026 · GitHub Advisory Database

    Updated

    ### Description A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have

Sources

  • CVE.orgVulnerability recordCVE-2026-9799

    Official CVE identifier

    cve.org
  • GitHub Advisory DatabasePackage advisoryGHSA-w3p3-7cjg-vgfw

    Keycloak allows unauthorized access to resources via uma permission ticket bypass

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-9799

    A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for th

    advisories.gitlab.com
  • OpenSSF OSV / OSV ScannerPackage advisoryBIT-keycloak-2026-9799

    Keycloak: keycloak: unauthorized access to resources via uma permission ticket bypass

    osv.dev
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-w3p3-7cjg-vgfw

    Keycloak allows unauthorized access to resources via uma permission ticket bypass

    osv.dev

References

Freshness

Last verified in this catalog Oct 30, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitLab Advisory DatabaseOct 31, 2026
  • CVE.orgOct 30, 2026
  • GitHub Advisory DatabaseOct 30, 2026
  • OpenSSF OSV / OSV ScannerOct 30, 2026
  • OpenSSF OSV / OSV ScannerOct 30, 2026