CVE-2026-91181

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

Scoring

Severity

MEDIUM

CVSS base score

6.5

CVSS vector

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

EPSS probability

0.23%

CWE

CWE-863

Published

2026-09-14

Last modified

2026-09-16

Affected products

• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost

Weakness type

• CWE-863

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