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CVE-2026-84807— Kimai before 2.65.0 Authentication Bypass via Team Creation

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（kimai/kimai）版本 2.65.0 及之前版本中存在一个业务逻辑/不当授权漏洞，位于默认的团队创建端点。拥有项目权限管理权限的已认证用户，可以创建或引用一个名称与现有团队相同的客户、项目或活动。由于端点 、 和 会复用同名现有团队，并在未验证当前用户是否有权管理该团队的情况下，将当前用户添加为团队负责人，攻击者因此可获取该现有团队的管理员（团队负责人）权限。该漏洞已在 2.65.0 版本中修复。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1079
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I. Basic Information for CVE-2026-84807

Vulnerability Information
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Vulnerability Title
Kimai before 2.65.0 Authentication Bypass via Team Creation
Source: CVE Program / CVE List V5
Vulnerability Description
Kimai (kimai/kimai) through 2.65.0 contains a business logic / improper authorization vulnerability in the default team creation endpoints. An authenticated user with project permission-management privileges can create or use a customer, project, or activity whose name matches an existing team; because the endpoints POST /api/customers/{id}/team, POST /api/projects/{id}/team, and POST /api/activities/{id}/team reuse an existing team of the same name and add the current user as teamlead without verifying that the user is authorized to manage that team, the attacker gains unauthorized team-lead (administration) rights over the existing team. Fixed in 2.65.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
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-2026-84807

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III. Intelligence Information for CVE-2026-84807

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Other References for CVE-2026-84807 (2)

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

CVE-2026-84806 5.4 MEDIUM Kimai before 2.63.0 Authorization Bypass via Team Access Endpoints
CVE-2026-84804 5.4 MEDIUM Kimai before 2.65.0 Authorization Bypass via Team Activity API
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-266

V. Comments for CVE-2026-84807

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