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CVE-2026-66412— Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC

Quick assessment

Affected
Leantime Leantime
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是Leantime公司开源的一个面向非项目经理的以目标为中心的项目管理系统。 Leantime 3.6.2及之前版本存在授权问题漏洞，该漏洞源于损坏的访问控制，允许已认证用户通过向tickets.getMilestone JSON-RPC端点提供任意整数里程碑ID，读取未分配项目的里程碑数据，进而枚举整数里程碑ID，访问项目规划信息、里程碑标题、描述和时间线。

CVSS 6.5 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Leantime Leantime ≤ 3.6.2 affected
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I. Basic Information for CVE-2026-66412

Vulnerability Information
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Vulnerability Title
Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC
Source: CVE Program / CVE List V5
Vulnerability Description
Leantime 3.6.2 and prior contains a broken access control vulnerability that allows authenticated users to read milestone data from projects they are not assigned to by supplying arbitrary integer milestone IDs to the tickets.getMilestone JSON-RPC endpoint. Attackers can enumerate integer milestone IDs through the JSON-RPC API to access project planning information, milestone titles, descriptions, and timelines across all projects on the instance regardless of project membership.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Leantime 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Leantime是Leantime公司开源的一个面向非项目经理的以目标为中心的项目管理系统。 Leantime 3.6.2及之前版本存在授权问题漏洞，该漏洞源于损坏的访问控制，允许已认证用户通过向tickets.getMilestone JSON-RPC端点提供任意整数里程碑ID，读取未分配项目的里程碑数据，进而枚举整数里程碑ID，访问项目规划信息、里程碑标题、描述和时间线。
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 Leantime 0 ~ 3.6.2 -

II. Public POCs for CVE-2026-66412

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III. Intelligence Information for CVE-2026-66412

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Patches & Fixes for CVE-2026-66412 (2)

Vendor Advisories for CVE-2026-66412 (1)

Other References for CVE-2026-66412 (1)

IV. Related Vulnerabilities

Same product: Leantime
Same vendor: Leantime
Same weakness: CWE-639

V. Comments for CVE-2026-66412

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