What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-27 · updated 2026-07-28
• Weakness: CWE-639

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.

Affected products

• Leantime: through 3.6.2

References

• 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
• https://github.com/Leantime/leantime/pull/3657

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