CVE-2026-8075CWE-754

CVE-2026-8075

Medium · published July 17, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
35.2
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00420 · 35.2th percentile
Weakness
CWE-754 · Improper Check for Unusual or Exceptional Conditions
Published
2026-07-17T15:17Z
Affected products (3)
ProductVersionsFixed in
mattermost/mattermost_desktop< 5.13.65.13.6
mattermost/mattermost_desktop> 6.0.0, ≤ 6.0.2—
mattermost/mattermost_desktop≥ 6.2.0, < 6.2.16.2.1
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 17 JUL 10:05Z
    Posting a malicious markdown image crashes the Mattermost Desktop App
    cvelistv5