Vulnerability Details CVE-2026-3495
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 9.1%
CVSS Severity
CVSS v3 Score 3.8
References
Products affected by CVE-2026-3495
-
cpe:2.3:a:mattermost:mattermost_server:10.11.0
-
cpe:2.3:a:mattermost:mattermost_server:10.11.1
-
cpe:2.3:a:mattermost:mattermost_server:10.11.10
-
cpe:2.3:a:mattermost:mattermost_server:10.11.11
-
cpe:2.3:a:mattermost:mattermost_server:10.11.12
-
cpe:2.3:a:mattermost:mattermost_server:10.11.13
-
cpe:2.3:a:mattermost:mattermost_server:10.11.2
-
cpe:2.3:a:mattermost:mattermost_server:10.11.3
-
cpe:2.3:a:mattermost:mattermost_server:10.11.4
-
cpe:2.3:a:mattermost:mattermost_server:10.11.5
-
cpe:2.3:a:mattermost:mattermost_server:10.11.6
-
cpe:2.3:a:mattermost:mattermost_server:10.11.7
-
cpe:2.3:a:mattermost:mattermost_server:10.11.8
-
cpe:2.3:a:mattermost:mattermost_server:10.11.9
-
cpe:2.3:a:mattermost:mattermost_server:11.5.0
-
cpe:2.3:a:mattermost:mattermost_server:11.5.1