CVE-2026-26206

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.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0007

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-307 CWE-307

CWE-362 CWE-362

CWE-367 CWE-367

Affected Products

Vendor	Product	Versions
wazuh	wazuh	4.0.0 — 4.14.4

References

Advisories & Patches

https://github.com/wazuh/wazuh/security/advisories/GHSA-m2mr-xhhv-jx58 https://github.com/wazuh/wazuh/security/advisories/GHSA-m2mr-xhhv-jx58

Exploits

https://github.com/wazuh/wazuh/security/advisories/GHSA-m2mr-xhhv-jx58 https://github.com/wazuh/wazuh/security/advisories/GHSA-m2mr-xhhv-jx58

Other References

https://github.com/wazuh/wazuh/releases/tag/v4.14.4

Frequently Asked Questions

What is CVE-2026-26206? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-26206? +

CVE-2026-26206 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0007, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-26206? +

CVE-2026-26206 affects products from wazuh, specifically: wazuh. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-26206? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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