CVE-2026-80199

LOW 3.7

Kimai before 2.54.0 Username Enumeration via Timing Oracle

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

Kimai before 2.54.0 contains a timing oracle vulnerability in TokenAuthenticator that allows unauthenticated attackers to enumerate valid usernames via X-AUTH-USER header. Attackers can measure response time differences when the password hasher runs only for existing users, enabling username enumeration with no login throttling protection.

CWE	CWE-208
Vendor	kimai
Product	kimai
Published	Aug 25, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

kimai / kimai

0 < 2.54.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2 vulncheck.com: https://www.vulncheck.com/advisories/kimai-before-2.54.0-username-enumeration-via-timing-oracle

Credits

🔍 melnicek