CVE-2026-76647

Leantime JSON-RPC API contains a missing authorization vulnerability

Published Aug 19, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Weaknesses CWE-284
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-200
CWE-639
CWE-862
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
First Time appeared Leantime
Leantime json-rpc Api
Vendors & Products Leantime
Leantime json-rpc Api
Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
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.
Title Leantime JSON-RPC API contains a missing authorization vulnerability
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Aug 27, 2026, 3:49 PM
Reserved
Aug 19, 2026, 3:24 PM
Status
Deferred
Published
Aug 19, 2026, 8:17 PM
Modified
Sep 8, 2026, 2:07 PM