Vulnerability · Published Aug 19, 2026 · Assigned by certcc
CVE-2026-76647Leantime JSON-RPC API contains a missing authorization vulnerability
High 8.8
In plain English
A high-severity missing authorization in JSON-RPC API from Leantime. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Leantime | JSON-RPC API | 0 – through 3.8.0 |
Weakness: CWE-862, CWE-200, CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H