Vulnerability Report

CVE-2026-66412

Title: Broken Access Control in Leantime Milestone Data

Auth Bypass

Proof Of Concept

PoC Available for CVE-2026-66412

CWE Category CWE-639
Published Date Jul 27, 2026
Modified Date Jul 28, 2026
Exploit Status Available
Score 7.1 CVSS v4.0
Exploit Probability (EPSS)
0.24%

Vulnerability Summary

CVE-2026-66412: 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.

Impacted Vendors

Analysis in Progress...

Reference Links

https://github.com/Leantime/leantime/commit/68898eeb914882a21797523f2782914795bc67ae https://github.com/Leantime/leantime/pull/3657 https://github.com/Leantime/leantime/security/advisories/GHSA-wv69-xr82-phr6 https://www.vulncheck.com/advisories/leantime-all-versions-prior-to-and-broken-access-control-via-tickets-getmilestone-json-rpc
CVSS v4.0
Source Entity [email protected]
Severity HIGH
7.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
N/A
RAW VECTOR CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-66412 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/javokhir-sec/CVE-PoC-Hub
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected Stack

No specific products linked.