Access Control Vulnerability in Kimai Open-Source Time Tracking Application
CVE-2026-52821

5.3MEDIUM

Key Information:

Vendor

Kimai

Status
Kimai
Vendor
CVE Published:
15 September 2026

What is CVE-2026-52821?

The Kimai open-source time tracking application has a vulnerability that allows unauthorized users to create linked activities or projects without proper authorization checks. Prior to version 2.57.0, HTTP GET and POST requests to endpoints for creating activities and projects only required the generic capabilities, compromising the integrity of project and customer configurations. An attacker knowledgeable of valid identifiers can exploit this flaw to associate unauthorized child objects with legitimate parent projects or customers, potentially affecting time entries, rates, reporting, and billing processes. This issue has been addressed in version 2.57.0.

Affected Version(s)

kimai < 2.57.0

References

https://github.com/kimai/kimai/security/advisories/GHSA-3...
x_refsource_CONFIRM
https://github.com/kimai/kimai/pull/5929
x_refsource_MISC
https://github.com/kimai/kimai/commit/976d38e8a4485a1c923...
x_refsource_MISC

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.