# CVE-2026-80199

## Summary

- **CVE ID:** CVE-2026-80199
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-208
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 26, 2026

## Description

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.

## Affected Products

- kimai — kimai (0)
- kimai — kimai (2.54.0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._