Medium 6.5Published Jul 27, 2026

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

Updated under an hour ago (Oct 28, 2026, 6:23 AM ET)

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Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-639
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Leantime Leantime leantime:leantime (from the name)	through 3.6.2	CNA record

References

References

https://github.com/Leantime/leantime/security/advisories/GHSA-wv69-xr82-phr6	vendor-advisory
https://github.com/Leantime/leantime/pull/3657	issue-tracking
https://github.com/Leantime/leantime/commit/68898eeb914882a21797523f2782914795bc67ae	patch
https://www.vulncheck.com/advisories/leantime-all-versions-prior-to-and-broken-access-control-via-tickets-getmilestone-json-rpc	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.