CVE-2026-20719CWE-754

DoS via URL Previews Rendering Malicious SVGs

Medium · published March 25, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
27.4
In the wild
Unconfirmed
What it is

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00351 · 27.4th percentile
Weakness
CWE-754 · Improper Check for Unusual or Exceptional Conditions
Published
2026-03-25T16:30Z
EPSS history
Timeline
  • 25 MAR 16:30Z
    DoS via URL Previews Rendering Malicious SVGs
    cvelistv5