CVSS 3.1
4.2 mediumCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:NCVE-2026-15754
Medium (4.2) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days.
Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-31)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server