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CVE-2026-84804— Kimai before 2.65.0 Authorization Bypass via Team Activity API

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 在 2.65.0 之前的版本中，通过 API 端点移除团队对活动、项目和客户的访问权限时，未能正确校验权限。拥有 权限的已认证用户可以绕过 检查，从而在没有相应权限的情况下撤销团队的访问权限，导致授权控制被绕过。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-84804

Vulnerability Information
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Vulnerability Title
Kimai before 2.65.0 Authorization Bypass via Team Activity API
Source: CVE Program / CVE List V5
Vulnerability Description
Kimai before 2.65.0 fails to properly validate permissions when removing team access to activities, projects, and customers via API endpoints. Authenticated users with edit_team permission can revoke team access without the required permissions_activity check, bypassing authorization controls.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kimai kimai 0 ~ 2.65.0 -

II. Public POCs for CVE-2026-84804

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III. Intelligence Information for CVE-2026-84804

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Other References for CVE-2026-84804 (2)

Same Patch Batch · kimai · 2026-09-02 · 5 CVEs total

CVE-2026-84807 5.4 MEDIUM Kimai before 2.65.0 Authentication Bypass via Team Creation
CVE-2026-84806 5.4 MEDIUM Kimai before 2.63.0 Authorization Bypass via Team Access Endpoints
CVE-2026-84808 4.3 MEDIUM Kimai before 2.65.0 Authorization Bypass via API Timesheet
CVE-2026-84805 4.3 MEDIUM Kimai 2.61.0 before 2.63.0 Authentication Bypass via API

IV. Related Vulnerabilities

Same product: kimai
Same vendor: kimai
Same weakness: CWE-284

V. Comments for CVE-2026-84804

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