EUVD-2026-39471
GHSA-79qw-g39g-mfxc
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Network-reachable with low complexity; a low-privilege authenticated account suffices (PR:L); full authorization bypass yields high confidentiality and integrity impact but no availability effect (A:N).
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
1DescriptionCVE.org
A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.
AnalysisAI
Authorization bypass in the Keycloak Policy Enforcer allows any authenticated user to circumvent all enforced access controls - role, scope, and User-Managed Access (UMA) permission checks - by embedding the configured access-denied page path inside a request URL as a path segment or query parameter. The affected component ships in the Red Hat Build of Keycloak, and successful exploitation grants unauthorized access to protected resources. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) a valid authenticated account of any privilege level (CVSS PR:L - not anonymous), and (2) the target application must use the Keycloak Policy Enforcer adapter with an access-denied page path configured, since the bypass works by including that exact configured path in the request URL as a path segment or query parameter. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N): network-reachable, low complexity, only a low-privilege authenticated account required, with high confidentiality and integrity impact and no availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privilege authenticated user of a Keycloak-protected application finds that requests to restricted resources are blocked by the Policy Enforcer. They re-issue the request with the configured access-denied page path appended as an extra path segment or added as a query parameter; the enforcer treats the request as exempt, skips all role/scope/UMA checks, and returns the protected data. … |
| Remediation | Apply the fixed Red Hat Build of Keycloak release once published; consult the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-9800 and the tracking bug at https://bugzilla.redhat.com/show_bug.cgi?id=2482472 for the exact patched version, which is not stated in the available data (no vendor-released fix version was provided, so verify the target release directly with Red Hat before scheduling). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Inventory all Red Hat Build of Keycloak deployments and enumerate resources protected by Policy Enforcer; activate comprehensive audit logging on Keycloak access decisions. …
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