Vulnerability Details CVE-2026-18795
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to enforce DM/GM check on server side which allows an authenticated user to quarantine a post belonging to DM or GM via direct API call.. Mattermost Advisory ID: MMSA-2026-00756
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 4.2%
CVSS Severity
CVSS v3 Score 6.4
References
Products affected by CVE-2026-18795
-
cpe:2.3:a:mattermost:mattermost_server:11.10.0
-
cpe:2.3:a:mattermost:mattermost_server:11.7.0
-
cpe:2.3:a:mattermost:mattermost_server:11.7.1
-
cpe:2.3:a:mattermost:mattermost_server:11.7.2
-
cpe:2.3:a:mattermost:mattermost_server:11.7.3
-
cpe:2.3:a:mattermost:mattermost_server:11.7.4
-
cpe:2.3:a:mattermost:mattermost_server:11.7.5
-
cpe:2.3:a:mattermost:mattermost_server:11.7.6
-
cpe:2.3:a:mattermost:mattermost_server:11.7.7
-
cpe:2.3:a:mattermost:mattermost_server:11.7.8
-
cpe:2.3:a:mattermost:mattermost_server:11.7.9
-
cpe:2.3:a:mattermost:mattermost_server:11.8.0
-
cpe:2.3:a:mattermost:mattermost_server:11.8.1
-
cpe:2.3:a:mattermost:mattermost_server:11.8.2
-
cpe:2.3:a:mattermost:mattermost_server:11.8.3
-
cpe:2.3:a:mattermost:mattermost_server:11.8.4
-
cpe:2.3:a:mattermost:mattermost_server:11.8.5
-
cpe:2.3:a:mattermost:mattermost_server:11.9.0
-
cpe:2.3:a:mattermost:mattermost_server:11.9.1