CVE-2026-26206 Wazuh: API brute-force protection bypass via race condition in login attempt tracking
Attackers can bypass Wazuh API brute-force protection via race conditions, allowing excessive password guessing attempts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26206?
CVE-2026-26206 is a medium-severity vulnerability in Wazuh Wazuh, published on 29 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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 (max_login_attempts, 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.
Which versions are affected by CVE-2026-26206?
It affects 1 product.
Products include Wazuh Wazuh.
How do I fix CVE-2026-26206?
No fix has been published for CVE-2026-26206 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-26206 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26206 exists.
Other vulnerabilities in Wazuh Wazuh
- CVE-2025-24016 Wazuh Server Deserialization of Untrusted Data
- CVE-2024-32038 Wazuh Analysis Engine Event Decoder Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2021-44079 Command injection in n/a
- CVE-2024-1243 Remote code execution and local privilege escalation in Wazuh Windows agent via NetNTLMv2 hash theft
- CVE-2026-61800 Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fix for CVE-2026-30893)
Sources
Also known as GHSA-m2mr-xhhv-jx58.