CVE-2026-8075

MEDIUM

Posting a malicious markdown image crashes the Mattermost Desktop App

Title source: cna
STIX 2.1

Description

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. Mattermost Advisory ID: MMSA-2026-00668

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00668
https://mattermost.com/security-updates

Scores

CVSS v3 6.5
EPSS 0.0024
EPSS Percentile 14.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-754
Status published
Products (6)
Mattermost/Mattermost < 5.5.13
Mattermost/Mattermost < 6.0.2
Mattermost/Mattermost 5.13.6.0
Mattermost/Mattermost 6.2.1.0
Mattermost/Mattermost 6.3.0
mattermost/mattermost_desktop 5.5.13 - 5.13.6
Published Jul 17, 2026
Tracked Since Jul 17, 2026