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CVE-2026-66412 is a broken access control vulnerability in Leantime 3.6.2 and earlier. The flaw affects the tickets.getMilestone JSON-RPC endpoint, which fails to properly enforce project-level authorization when retrieving milestone records. An authenticated user can supply arbitrary integer milestone identifiers to this endpoint and obtain milestone data for projects to which they are not assigned. Because milestone identifiers can be enumerated, the issue enables unauthorized cross-project access to planning information, including milestone titles, descriptions, and timeline-related data across the instance.
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