Vulnerability in Wazuh
CVE-2026-44255
Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.0.0 until 4.14.6 and 5.0.0-beta2, AuthenticationManager.check_user() in framework/wazuh/rbac/orm.py performs check_password_hash() only when the supplied username exists. A nonexistent username returns immediately, while a valid username causes an expensive bcrypt calculation. An unauthenticated remote attacker can compare authentication response times to enumerate valid Wazuh usernames and use that information in subsequent credential attacks. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Wazuh — versions 5.0.0, >= 5.0.0-beta1, < 5.0.0-beta2, >= 4.0.0, < 4.14.6
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9 (Exploit, Vendor Advisory)
- github.com/wazuh/wazuh/pull/35757 (Patch, Issue Tracking)
- github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981 (Patch)
- github.com/wazuh/wazuh/releases/tag/v4.14.6 (Release Notes)
- github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 (Release Notes)
Frequently asked questions
- What is CVE-2026-44255?
- CVE-2026-44255 is a medium-severity vulnerability in Wazuh, classified under CWE-208. CVSS score: 5.3/10. Published 2026-08-19.
- How severe is CVE-2026-44255?
- Medium severity. CVSS v3 base score is 5.3 out of 10.