CVE-2026-88770 Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-force-locked accounts
Attackers with active sessions can bypass brute-force account locks in Keycloak to obtain new tokens and maintain unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88770?
CVE-2026-88770 is a medium-severity vulnerability in Red Hat Build of Keycloak, published on 10 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-307
Which versions are affected by CVE-2026-88770?
How do I fix CVE-2026-88770?
No fix has been published for CVE-2026-88770 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-88770 being exploited?
There is no known exploitation of CVE-2026-88770 in the wild and no public exploit code.
Sources
Also known as GHSA-q4q6-f3mm-hfmv.