Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M
CVE-2026-52821Kimai: Improper Authorization in Kimai Activity Creation with Preset Project Allows Creation Under Unauthorized Projects
Medium 5.3
In plain English
A medium-severity authorization bypass via user-controlled key in kimai from kimai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | kimai/kimai | 2.57.0 | GHSA-3q6q-26vg-v97x |
Affected products (as reported)
Weakness: CWE-639, CWE-862 · 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
References
- https://github.com/kimai/kimai/security/advisories/GHSA-3q6q-26vg-v97x x_refsource_CONFIRM
- https://github.com/kimai/kimai/pull/5929 x_refsource_MISC
- https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849 x_refsource_MISC
- https://github.com/kimai/kimai/releases/tag/2.57.0 x_refsource_MISC
- https://www.kimai.org/en/security/ghsa-3q6q-26vg-v97x x_refsource_MISC