← Back

CVE-2026-20796

nvd nist
Published: Feb 13, 2026Modified: Jun 17, 2026

JSON object

Loading...
3.1
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Exploitability: 1.6 / Impact: 1.4
Source: responsibledisclosure@mattermost.com (Secondary)

Description

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

Affected (1)

Mattermost
1 product
Mattermost Server
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Mattermost Server
From 10.11.0 to 10.11.10

Related CWEs

CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition
The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

References (1)

Source: responsibledisclosure@mattermost.com
Vendor Advisory

Timeline

No history available yet.