CVE-2026-12284CWE-346

CVE-2026-12284

Low · published September 17, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
2.5
In the wild
Unconfirmed
What it is

Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the desktopAPI.leaveCall IPC message. Mattermost Advisory ID: MMSA-2026-00699

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00131 · 2.5th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-09-17T20:17Z
Affected products (1)
ProductVersionsFixed in
mattermost/mattermost_desktop≥ 6.2.0, < 6.2.36.2.3
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 19 SEP 03:50Z
    EPSS moved — → 0%
    epss
  • 17 SEP 15:11Z
    Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler
    cvelistv5