CVE-2026-66412 Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC
Authenticated users can read milestone data from unauthorized projects by enumerating IDs via the JSON-RPC API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66412?
CVE-2026-66412 is a high-severity missing authorization vulnerability in Leantime, published on 27 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-66412?
How do I fix CVE-2026-66412?
No fix has been published for CVE-2026-66412 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-66412 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66412 exists.
Sources
Also known as GHSA-p3jw-q4jg-x8w9, GHSA-wv69-xr82-phr6.