CVE-2026-66412: Leantime

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Leantime 3.6.2 and prior contains a broken access control vulnerability that allows authenticated users to read milestone data from projects they are not assigned to by supplying arbitrary integer milestone IDs to the tickets.getMilestone JSON-RPC endpoint. Attackers can enumerate integer milestone IDs through the JSON-RPC API to access project planning information, milestone titles, descriptions, and timelines across all projects on the instance regardless of project membership.

Affected products

• Leantime Leantime: up to and including 3.6.2

Published 2026-07-27. Last modified 2026-07-28.