In short
- CVE-2026-9798 is a MEDIUM (CVSS 4.3) vulnerability affecting org.keycloak:keycloak-services.
- Chance of exploitation in the next 30 days (EPSS): 0.38%, higher than 31.5% of all vulnerabilities.
- No patched version is listed yet: follow the vendor's advisory in References.
Description
A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.
NVD description
A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.
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