EUVD-2026-39474
GHSA-q929-g23j-2rc7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Possession of a previously issued RAT constitutes low-privilege access (PR:L), not unauthenticated; no availability impact applies.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
1DescriptionCVE.org
A flaw was found in Keycloak's client registration service. A remote attacker, possessing a previously issued Registration Access Token (RAT), could exploit this vulnerability to re-enable a client that an administrator had explicitly disabled. This bypasses security controls, allowing the attacker to reset the client's secret and potentially regain privileged API access. The primary impact includes unauthorized information disclosure and potential integrity compromise.
AnalysisAI
Keycloak's client registration service fails to invalidate Registration Access Tokens (RATs) when an administrator explicitly disables a client, allowing any holder of a previously issued RAT to re-enable that client and reset its secret. Affected product is Red Hat Build of Keycloak (all versions per available CPE data). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a valid Registration Access Token previously issued for the target Keycloak client - either legitimately obtained during an earlier registration, stolen from storage, or exposed via logs or configuration files. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) warrants scrutiny: the PR:N designation implies no prior privileges are required, but the vulnerability description explicitly states the attacker must possess a 'previously issued Registration Access Token.' A RAT is a bearer credential - its possession constitutes a form of low-level privilege, making PR:L a more accurate independent assessment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who previously registered an OAuth2 client in a Keycloak realm and retained the issued RAT, or who acquired the RAT through credential theft or exposure, sends an authenticated PUT request to the Keycloak client registration endpoint using that token against a client the administrator has since disabled. Keycloak processes the request without checking the client's disabled status, re-enables the client, and allows the attacker to rotate the client secret - restoring full OAuth2/OIDC API access that was intentionally revoked. … |
| Remediation | No specific patched version has been identified from the available data - the CPE uses a wildcard and no fix version is cited in the references. … Detailed patch versions, workarounds, and compensating controls in full report. |
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