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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是Kimai团队开源的一款项目管理系统。 Kimai 2.65.0及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于业务逻辑和授权不当，默认团队创建端点在未验证用户是否有权管理该团队的情况下，复用同名团队并将当前用户添加为团队负责人，可能导致已认证用户获得现有团队的未授权管理权限。

CVSS 5.4 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1079

Affected Version Matrix 2

VendorProduct Version RangeStatus
kimai kimai < 2.65.0 affected
2.65.0 unaffected
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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
Vulnerability Title
Kimai 权限许可和访问控制问题漏洞
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 2.65.0及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于业务逻辑和授权不当，默认团队创建端点在未验证用户是否有权管理该团队的情况下，复用同名团队并将当前用户添加为团队负责人，可能导致已认证用户获得现有团队的未授权管理权限。
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 ~ 2.65.0 -

II. Public POCs for CVE-2026-84807

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III. Intelligence Information for CVE-2026-84807

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Vendor Advisories 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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