CVE-2026-66412

Description

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.

References

• https://github.com/Leantime/leantime/commit/68898eeb914882a21797523f2782914795bc67ae
• https://github.com/Leantime/leantime/pull/3657
• https://github.com/Leantime/leantime/security/advisories/GHSA-wv69-xr82-phr6
• https://www.vulncheck.com/advisories/leantime-all-versions-prior-to-and-broken-access-control-via-tickets-getmilestone-json-rpc