CVE-2026-96260CWE-789

CVE-2026-96260

Medium · published September 23, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
35.3
In the wild
Unconfirmed
What it is

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to enforce a request body size limit during CSRF validation of plugin requests which allows an authenticated user to exhaust server memory and cause a denial of service via a large request body sent to a plugin endpoint.. Mattermost Advisory ID: MMSA-2026-00775

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 · 35.3th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-09-23T01:17Z
Affected products (4)
ProductVersionsFixed in
mattermost/mattermost_server≥ 11.7.0, < 11.7.1111.7.11
mattermost/mattermost_server≥ 11.8.0, < 11.8.611.8.6
mattermost/mattermost_server≥ 11.9.0, < 11.9.211.9.2
mattermost/mattermost_server≥ 11.10.0, < 11.10.211.10.2
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 24 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 22 SEP 20:34Z
    Mattermost server missing request body size limit on plugin routes allows denial of service by an authenticated user
    cvelistv5