CVE-2026-76647 Leantime JSON-RPC API contains a missing authorization vulnerability
An authenticated user can bypass authorization in the JSON-RPC dispatcher to modify other users' accounts and take over their sessions.
- 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-2026-76647?
CVE-2026-76647 is a high-severity missing authorization vulnerability in Leantime JSON-RPC API, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Leantime JSON-RPC API through version 3.9.0 contains a missing authorization vulnerability in the JSON-RPC dispatcher in app/Domain/Api/Controllers/Jsonrpc.php. The dispatcher does not enforce authorization before invoking service-layer methods, allowing an authenticated user to call methods or act on resources outside their intended permissions. For example, the editOwn method accepts a user-supplied user ID without verifying that it belongs to the caller, allowing an attacker to modify another user's account and set a new password, resulting in account takeover. This vulnerability is distinct from CVE-2026-59712 and CVE-2026-15509 because the root cause is the lack of centralized authorization enforcement in the JSON-RPC dispatcher rather than the behavior of an individual exposed method.
Which versions are affected by CVE-2026-76647?
How do I fix CVE-2026-76647?
No fix has been published for CVE-2026-76647 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-2026-76647 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-76647 exists.
Sources
Also known as GHSA-62fx-wqcf-qg97.