PT-2026-55154 · Maven · Org.Keycloak:Keycloak-Services

Published 2026-05-28 · Updated 2026-05-28

OSV

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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.

Fix

Weakness Enumeration

CWE-305

Related Identifiers

GHSA-Q6H7-XXP7-7429

Affected Products

Org.Keycloak:Keycloak-Services

References · 12

• https://osv.dev/vulnerability/GHSA-q6h7-xxp7-7429 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-9798 · Security Note
• https://github.com/keycloak/keycloak/commit/11c2695064cd93da1d333df3f69d4a4141e86c29 · Note
• https://github.com/keycloak/keycloak/commit/a11e3254efc16ae72ce5092b93b9f557a4ba43ae · Note
• https://github.com/keycloak/keycloak/pull/49903 · Note
• https://github.com/keycloak/keycloak/pull/49905 · Note
• https://github.com/keycloak/keycloak/issues/49432 · Note
• https://github.com/keycloak/keycloak/commit/2edc6b112e2dedce63062b89ab3c7ae542e0d9ac · Note
• https://github.com/keycloak/keycloak/pull/49791 · Note
• https://github.com/keycloak/keycloak · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2482470 · Note
• https://access.redhat.com/security/cve/CVE-2026-9798 · Note