CVE-2026-3116

MEDIUM

Improper Input Validation in Zoom Plugin Webhook Handler

Title source: cna

Description

Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589

References (1)

[Vendor Advisory] https://mattermost.com/security-updates

Scores

CVSS v3 4.9

EPSS 0.0005

EPSS Percentile 16.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-400

Status published

Products (9)

Mattermost/Mattermost < 10.11.11

Mattermost/Mattermost < 11.0.4

Mattermost/Mattermost < 11.1.3

Mattermost/Mattermost < 11.3.2

Mattermost/Mattermost 10.11.12

Mattermost/Mattermost 11.2.4

Mattermost/Mattermost 11.3.2

Mattermost/Mattermost 11.4.1

Mattermost/Mattermost 11.5.0

Published Mar 26, 2026

Tracked Since Mar 26, 2026