CVE-2026-44255

Wazuh: Username Enumeration via Timing Side-Channel

Published: Aug 19, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-208

5.3MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:NIntegrity

None

A:NAvailability

None

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Weaknesses

CWE-208

Affected Products

wazuh

oss-projectaka wazuh-manager, wazuh agent

wazuhMixed

Security Products / siem-soar

Exploitability

Official Patch Available

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References

https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9

github.com

https://github.com/wazuh/wazuh/pull/35757

github.com

https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981

github.com

and 2 more references View all →

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