Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC (CVE-2026-66412) | HOL Guard CVE

High · CVSS 7.1CVE-2026-66412

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

Answer in brief

CVE-2026-66412 records a High severity (CVSS 7.1) vulnerability in Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC. The current sources do not mark it as known exploited. The current feed maps Leantime/Leantime (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 27, 2026Updated Sep 24, 2026Source checked Sep 24, 2026First seen by HOL Sep 24, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Leantime/Leantime (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Leantime/Leantimegeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Leantime/Leantime.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 24, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.