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CVE-2026-91181

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

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6.5
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Exploitability: 1.2 / Impact: 5.2
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 sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret invite_id and email, and use it to join the team without authorization, via GET /api/v4/data_retention/policies/{policy_id}/teams.. Mattermost Advisory ID: MMSA-2026-00702

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-863
Incorrect Authorization
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

References (1)

Source: responsibledisclosure@mattermost.com
Vendor Advisory

Timeline

No history available yet.