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CVE-2026-80199— Kimai before 2.54.0 Username Enumeration via Timing Oracle

Quick assessment

Affected
kimai kimai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kimai 2.54.0 之前的版本中，TokenAuthenticator 存在一个时序或acles 漏洞，允许未经身份验证的攻击者通过 X-AUTH-USER 头部枚举有效用户名。由于密码哈希处理仅对已存在的用户执行，攻击者可以通过测量响应时间的差异来枚举用户名，而系统缺乏登录速率限制（throttling）保护。

CVSS 3.7 · Low EPSS 0.25% · P16

Affected Version Matrix 2

VendorProduct Version RangeStatus
kimai kimai < 2.54.0 affected
2.54.0 unaffected
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I. Basic Information for CVE-2026-80199

Vulnerability Information
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Vulnerability Title
Kimai before 2.54.0 Username Enumeration via Timing Oracle
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kimai kimai 0 ~ 2.54.0 -

II. Public POCs for CVE-2026-80199

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III. Intelligence Information for CVE-2026-80199

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Vendor Advisories for CVE-2026-80199 (2)

Same Patch Batch · kimai · 2026-08-25 · 10 CVEs total

CVE-2026-80193 8.8 HIGH Kimai before 2.62.0 Authorization Bypass via QuickEntry
CVE-2026-80202 8.8 HIGH Kimai before 2.56.0 Authorization Bypass via TimesheetVoter
CVE-2026-80196 7.5 HIGH Kimai before 2.58.0 Authentication Bypass via Password Reset Link
CVE-2026-80198 7.5 HIGH Kimai before 2.56.0 Information Disclosure via config() Twig Function
CVE-2026-80195 5.4 MEDIUM Kimai before 2.63.0 Team Membership Removal via API
CVE-2026-80194 4.3 MEDIUM Kimai before 2.64.0 Missing Authorization via ProjectViewController export
CVE-2026-80197 4.3 MEDIUM Kimai before 2.57.0 Improper Authorization via Favorite Endpoints
CVE-2026-80201 2.0 LOW Kimai before 2.53.0 API Token Leakage via Invoice Template
CVE-2026-80200 Kimai before 2.53.0 Open Redirect via RelayState

IV. Related Vulnerabilities

Same product: kimai
Same vendor: kimai
Same weakness: CWE-208

V. Comments for CVE-2026-80199

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