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CVE-2026-76647— Leantime JSON-RPC API contains a missing authorization vulnerability

Quick assessment

Affected
Leantime JSON-RPC API
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Leantime JSON-RPC API是Leantime公司的一款基于JSON的远程过程调用协议。 Leantime JSON-RPC API 3.9.0及之前版本存在安全漏洞，该漏洞源于JSON-RPC调度器缺少授权验证，调用服务层方法前未实施授权检查，允许已认证用户越权调用方法或操作资源，editOwn方法未验证用户ID归属，可修改其他用户账户并设置新密码，导致账户接管。

AI Predicted 8.1 Difficulty: Easy EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
Leantime JSON-RPC API ≤ 3.8.0 affected
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I. Basic Information for CVE-2026-76647

Vulnerability Information
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Vulnerability Title
Leantime JSON-RPC API contains a missing authorization vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Leantime JSON-RPC API 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Leantime JSON-RPC API是Leantime公司的一款基于JSON的远程过程调用协议。 Leantime JSON-RPC API 3.9.0及之前版本存在安全漏洞，该漏洞源于JSON-RPC调度器缺少授权验证，调用服务层方法前未实施授权检查，允许已认证用户越权调用方法或操作资源，editOwn方法未验证用户ID归属，可修改其他用户账户并设置新密码，导致账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Leantime JSON-RPC API 0 ~ 3.8.0 -

II. Public POCs for CVE-2026-76647

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III. Intelligence Information for CVE-2026-76647

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Security Blog Posts for CVE-2026-76647 (3)

IV. Related Vulnerabilities

Same vendor: Leantime

V. Comments for CVE-2026-76647

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