Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attacker requires an active device authorization session (PR:L); token disclosure grants confidentiality impact with no integrity or availability consequence.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
2DescriptionCVE.org
A flaw was found in the Device Authorization Grant flow of Keycloak, an identity and access management solution. The issue occurs because the token redemption process fails to check if a user account is currently locked due to brute-force protection. If an attacker has an active session for a locked account, they can complete the device login process and receive new security tokens. This allows the attacker to maintain access to the account even when it should be temporarily disabled to prevent unauthorized entry.
AnalysisAI
Keycloak's Device Authorization Grant flow (RFC 8628) fails to enforce brute-force account lockout during token redemption, allowing an attacker holding an active device authorization session for a locked account to complete the flow and obtain valid access and refresh tokens. Affected deployments include Red Hat Build of Keycloak and Red Hat Single Sign-On 7 across all versions flagged in the CPE data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Device Authorization Grant flow must be enabled on the target Keycloak realm and on at least one client registered within it (this flow is not enabled by default on all clients). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, base 6.5) correctly captures a network-reachable flaw requiring a prior attacker foothold - an active, unexpired device authorization session (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Patch available per vendor advisory - consult https://access.redhat.com/security/cve/CVE-2026-88770 for exact patched build versions of Red Hat Build of Keycloak and Red Hat Single Sign-On 7; exact fix versions are not independently confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-75289
GHSA-q4q6-f3mm-hfmv