CVE-2026-4646CWE-1287

Insufficient input validation in GitHub plugin API causes denial of service

Medium · published May 22, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
36.3
In the wild
Unconfirmed
What it is

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request handlers which allows an authenticated attacker to crash the plugin process via a crafted HTTP request to the PR details endpoint.. Mattermost Advisory ID: MMSA-2026-00638

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
0.00431 · 36.3th percentile
Weakness
CWE-1287 · Improper Validation of Specified Type of Input
Published
2026-05-22T10:25Z
EPSS history
Timeline
  • 22 MAY 10:25Z
    Insufficient input validation in GitHub plugin API causes denial of service
    cvelistv5