CVE-2026-8683CWE-770

Overly long URLs crash the Mattermost Desktop App

Medium · published June 15, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
27.9
In the wild
Unconfirmed
What it is

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00355 · 27.9th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-06-15T14:06Z
EPSS history
Timeline
  • 15 JUN 14:06Z
    Overly long URLs crash the Mattermost Desktop App
    cvelistv5