What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-639

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 products

• kimai: before 2.57.0

References

• https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849
• https://github.com/kimai/kimai/pull/5929
• https://github.com/kimai/kimai/releases/tag/2.57.0
• https://github.com/kimai/kimai/security/advisories/GHSA-3q6q-26vg-v97x
• https://www.kimai.org/en/security/ghsa-3q6q-26vg-v97x

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