← Back

CVE-2026-8821

nvd nist
Published: Sep 14, 2026Modified: Oct 7, 2026

JSON object

Loading...
7.1
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Exploitability: 2.8 / Impact: 4.2
Source: responsibledisclosure@mattermost.com (Secondary)

Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel member-management permission during playbook run creation, allowing an authenticated channel member to add an arbitrary user to a restricted channel via the run owner field.. Mattermost Advisory ID: MMSA-2026-00677

Affected (4)

Mattermost
1 product
Mattermost Server
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Mattermost
Mattermost Server
10.11.0 ≤ version < 10.11.23
Mattermost Server
11.7.0 ≤ version < 11.7.8
Mattermost Server
11.8.0 ≤ version < 11.8.5
Mattermost Server
11.9.0 ≤ version < 11.9.1

Related CWEs

CWE-862
Missing Authorization
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

References (1)

Source: responsibledisclosure@mattermost.com
Vendor Advisory

Timeline

No history available yet.