CVE-2026-8075: mattermost desktop before 5.13.6 (exclusive), after 6.0.0 (exclusive), through 6.0.2 (inclusive), from 6.2.0…

Affected technology

mattermost desktop · before 5.13.6 (exclusive)
mattermost

mattermost desktop · after 6.0.0 (exclusive), through 6.0.2 (inclusive)
mattermost

mattermost desktop · from 6.2.0 (inclusive), before 6.2.1 (exclusive)
mattermost

Mattermost · 0 through 5.5.13, 0 through 6.0.2
Mattermost

Description’s affected range: versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which

Component: Not specified by the source

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

What an attacker can do

The source says mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another channel members Desktop App via posting a malicious link with an embedded image that misses one of those headers. Vendor/CNA’s CVSS 3.1 assessment (base score 6.5/10) rates confidentiality and integrity impact as none; availability impact as high.