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CVE-2026-52821— Kimai: Improper Authorization in Kimai Activity Creation with Preset Project Allows Creation Under Unauthorized Projects

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 是一款开源的时间追踪应用。在 2.57.0 版本之前，针对 和 的 GET 或 POST 请求仅需具备通用的 或 权限即可执行，而不会校验用户对所传入的 Project 或 Customer 对象是否具有编辑权限。因此，知道有效 project.id 或 customer 标识符的用户可以利用 或 中的预设父级创建逻辑，在未获得授权的情况下，将新的子业务对象挂在一个未授权的父级之下，从而污染项目或客户配置，并影响后续的时间条目记录、费率、报表及计费行为。该问题已在 2.57.0 版本中修复。

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-52821

Vulnerability Information
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Vulnerability Title
Kimai: Improper Authorization in Kimai Activity Creation with Preset Project Allows Creation Under Unauthorized Projects
Source: CVE Program / CVE List V5
Vulnerability Description
Kimai is an open-source time tracking application. Prior to 2.57.0, GET or POST requests to /en/admin/activity/create/{project} and /en/admin/project/create/{customer} require only the generic create_activity or create_project capability and do not verify edit access to the supplied Project or Customer object. A user who knows a valid project.id or customer identifier can use the preset-parent creation logic in src/Controller/ActivityController.php or src/Controller/ProjectController.php to persist a new child business object under an unauthorized parent, polluting project or customer configuration and influencing later time-entry, rate, reporting, and billing behavior. This issue is fixed in version 2.57.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kimai kimai < 2.57.0 -

II. Public POCs for CVE-2026-52821

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III. Intelligence Information for CVE-2026-52821

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Patches & Fixes for CVE-2026-52821 (1)

Vendor Advisories for CVE-2026-52821 (1)

Vendor Pages for CVE-2026-52821 (1)

Same Patch Batch · kimai · 2026-09-15 · 10 CVEs total

CVE-2026-52824 9.1 CRITICAL Kimai: Default APP_SECRET in Docker Image Enables Cookie Forgery and Account Takeover
CVE-2026-52827 7.1 HIGH Kimai: Two-factor authentication bypass on the Kimai API
CVE-2026-52819 6.3 MEDIUM Kimai: Teamlead authorization bypass in GET /api/timesheets allows reading other users' ti
CVE-2026-52825 5.3 MEDIUM Kimai: Improper Authorization in Kimai Team Member and Team Activity Assignment APIs Allow
CVE-2026-52820 5.3 MEDIUM Kimai: Timesheet PATCH/POST allows assigning to project outside user's team via query_buil
CVE-2026-52823 5.3 MEDIUM Kimai: Login CSRF in Kimai Timesheet Stop and Restart API Endpoints Allows Unauthorized St
CVE-2026-52826 5.3 MEDIUM Kimai: Improper Authorization in Kimai Project, Customer, and Activity Rate Edit Endpoints
CVE-2026-52828 5.3 MEDIUM Kimai: ExportTemplate CRUD Missing Authorization Check Allows Unauthorized TEAMLEAD Access
CVE-2026-52822 5.3 MEDIUM Kimai: Improper Authorization in Kimai Timesheet Restart and Duplicate Allows New Timeshee

IV. Related Vulnerabilities

Same product: kimai
Same vendor: kimai
Same weakness: CWE-639

V. Comments for CVE-2026-52821

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