CVE-2026-3495: mattermost server from 10.11.0 (inclusive), before 10.11.14 (exclusive), from 11.5.0 (inclusive), before 11.5.2…

Affected technology

mattermost server · from 10.11.0 (inclusive), before 10.11.14 (exclusive)
mattermost

mattermost server · from 11.5.0 (inclusive), before 11.5.2 (exclusive)
mattermost

Mattermost · 11.5.0 through 11.5.1, 10.11.0 through 10.11.13
Mattermost

Description’s affected range: versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · High privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · High privileges required · User interaction required

What an attacker can do

An attacker with access to edit some site configuration can execute some malicious code via injecting some JS as part of those values. Vendor/CNA’s CVSS 3.1 assessment (base score 3.8/10) rates confidentiality and integrity impact as low; availability impact as none. NVD’s CVSS 3.1 assessment (base score 4.8/10) rates confidentiality and integrity impact as low; availability impact as none.