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Vulnerability record · CVE-2026-76647 · published 19 August 2026

CVE-2026-76647: Information exposure vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.51% · top 59.2% CWE-200 · Information exposureCWE-639 · Insecure direct object reference Deferred
8.8CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://leantime.io/unlocking-leantimes-power-a-guide-to-the-json-rpc-api/
https://vokecyber.com/blog/leantime-jsonrpc-editown-account-takeover
https://vokecyber.com/research/leantime-jsonrpc-editown-account-takeover
https://vokecyber.com/research/leantime-jsonrpc-editown-account-takeover

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Source: NIST National Vulnerability Database (record CVE-2026-76647), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.