Medium severity · published Aug 19, 2026
CVE-2026-44255
Wazuh: Username Enumeration via Timing Side-Channel
5.3
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
wazuh · wazuh
>= 4.0.0, < 4.14.6; >= 5.0.0-beta1, < 5.0.0-beta2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44255
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44255
Patch
https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981
Issue Tracking
https://github.com/wazuh/wazuh/pull/35757
Release Notes
https://github.com/wazuh/wazuh/releases/tag/v4.14.6
Release Notes
https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2
Exploit
https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9
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