CVE-2026-52826 Kimai: Improper Authorization in Project, Customer, and Activity Rate Edit Endpoints Allows Cross-Scope Rate Manipulation
Authenticated users can manipulate billing rates for unauthorized projects, customers, or activities by bypassing parent-child ownership checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-52826?
CVE-2026-52826 is a medium-severity missing authorization vulnerability in kimai, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kimai is an open-source time tracking application. Prior to 2.57.0, GET or POST requests to /en/admin/project/{id}/rate/{rate}, /en/admin/customer/{id}/rate/{rate}, and /en/admin/activity/{id}/rate/{rate} independently resolve the authorized parent identifier and the attacker-selected child rate identifier without confirming that the ProjectRate, CustomerRate, or ActivityRate belongs to that parent. An authenticated user who can edit one parent object can pair it with a rate record from an unauthorized project, customer, or activity and persist changes to billing configuration in kimai2_projects_rates, kimai2_customers_rates, or kimai2_activities_rates. This issue is fixed in version 2.57.0.
Which versions are affected by CVE-2026-52826?
2 open source packages ship an affected version, including kimai/kimai.
| Package | Affected | Fixed in |
|---|---|---|
kimai/kimai Packagist | All versions | 2.57.0 |
kimai/kimai Packagist | All versions | 2.57.0 |
How do I fix CVE-2026-52826?
Upgrade kimai/kimai to 2.57.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-52826 being exploited?
There is no known exploitation of CVE-2026-52826 in the wild and no public exploit code.
Sources
Also known as GHSA-2xgg-2x8h-8xw4.