CVE-2026-40479: Kimai

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HTML attribute context via the team member form prototype and rendered through innerHTML, this incomplete escaping allows HTML attribute injection. An authenticated user with ROLE_USER privileges can store a malicious alias that executes JavaScript in the browser of any administrator viewing the team form, resulting in stored XSS with privilege escalation. This issue has been fixed in version 2.53.0.

Affected products

• Kimai Kimai: before 2.53.0 (fixed in 2.53.0)

Published 2026-04-17. Last modified 2026-06-17.