CVE-2026-26206: Wazuh: API brute-force protection bypass via race condition in login attempt tracking
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 4.0.0 to before version 4.14.4, Wazuh's server API brute-force protection for POST /security/user/authenticate can be bypassed by sending concurrent authentication requests. Although the configured threshold (maxloginattempts, default 50) is enforced correctly for sequential requests, a parallel burst allows significantly more failed login attempts to be processed before the IP block is applied. This enables an attacker to perform more password guesses than the configured policy intends (e.g., 100 attempts processed where 50 should be allowed). This issue has been patched in version 4.14.4.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-26206?
CVE-2026-26206 has a high severity rating due to the potential for brute-force attack exploitation.
How do I fix CVE-2026-26206?
To mitigate CVE-2026-26206, upgrade Wazuh to version 4.14.4 or later.
What systems are affected by CVE-2026-26206?
CVE-2026-26206 affects Wazuh versions from 4.0.0 to before 4.14.4.
What is the nature of the vulnerability in CVE-2026-26206?
CVE-2026-26206 involves a race condition in login attempt tracking that allows bypassing brute-force protection.
Are there any known exploits for CVE-2026-26206?
As of now, there are no public exploits specifically demonstrated for CVE-2026-26206.