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CVE-2026-80202— Kimai before 2.56.0 Authorization Bypass via TimesheetVoter

Quick assessment

Affected
kimai kimai
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kimai是Kimai团队开源的一款项目管理系统。 Kimai 2.56.0之前版本存在授权问题漏洞，该漏洞源于TimesheetVoter::voteOnAttribute()未强制执行团队成员资格检查，可能导致拥有ROLE_TEAMLEAD或edit_other_timesheet/delete_other_timesheet权限的已认证用户通过API读取、修改和永久删除任意用户的时间表。

CVSS 8.8 · High EPSS 0.39% · P31

Affected Version Matrix 2

VendorProduct Version RangeStatus
kimai kimai < 2.56.0 affected
2.56.0 unaffected
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I. Basic Information for CVE-2026-80202

Vulnerability Information
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Vulnerability Title
Kimai before 2.56.0 Authorization Bypass via TimesheetVoter
Source: CVE Program / CVE List V5
Vulnerability Description
Kimai before 2.56.0 does not enforce team-membership checks in TimesheetVoter::voteOnAttribute(), which maps permissions only to own_timesheet or other_timesheet. As a result, any authenticated user with ROLE_TEAMLEAD (or a role holding edit_other_timesheet/delete_other_timesheet) can read, modify, and permanently delete timesheets belonging to any user system-wide via the API, regardless of team membership. Timesheet IDs are sequential integers and trivially enumerable. ROLE_USER accounts are correctly restricted. (Note: the maintainers characterize this behavior as matching the documented permission model.)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Kimai 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kimai是Kimai团队开源的一款项目管理系统。 Kimai 2.56.0之前版本存在授权问题漏洞，该漏洞源于TimesheetVoter::voteOnAttribute()未强制执行团队成员资格检查，可能导致拥有ROLE_TEAMLEAD或edit_other_timesheet/delete_other_timesheet权限的已认证用户通过API读取、修改和永久删除任意用户的时间表。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kimai kimai 0 ~ 2.56.0 -

II. Public POCs for CVE-2026-80202

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7592 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-80202

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Vendor Advisories for CVE-2026-80202 (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-2026-80196 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-2026-80200 4.7 MEDIUM Kimai before 2.53.0 Open Redirect via RelayState
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-2026-80199 3.7 LOW Kimai before 2.54.0 Username Enumeration via Timing Oracle
CVE-2026-80201 2.0 LOW Kimai before 2.53.0 API Token Leakage via Invoice Template

IV. Related Vulnerabilities

Same product: kimai
Same vendor: kimai
Same weakness: CWE-863

V. Comments for CVE-2026-80202

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