CVEvulnerability

CVE-2026-9708

4.9 MEDIUM Published 2026-07-13 Modified 2026-07-13 Official page ↗
Status
Analyzed
Published
2026-07-13
Last modified
2026-07-13
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.9 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-639

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683

Affected configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.20) • mattermost mattermost server (>= 11.6.0 < 11.6.5) • mattermost mattermost server (>= 11.7.0 < 11.7.3)

Related

Weakness · CWE (1)

  • CWE-639 Authorization Bypass Through User-Controlled Key weakness

References