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Keycloak CVE-2026-88770

| EUVDEUVD-2026-75289 MEDIUM
Improper Restriction of Excessive Authentication Attempts (CWE-307)
2026-09-10 redhat GHSA-q4q6-f3mm-hfmv
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Attacker requires an active device authorization session (PR:L); token disclosure grants confidentiality impact with no integrity or availability consequence.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Sep 10, 2026 - 07:51 vuln.today
CVE Published
Sep 10, 2026 - 07:18 cve.org
MEDIUM 6.5

DescriptionCVE.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

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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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.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-88770 vulnerability details – vuln.today

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