CVE-2026-9708

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CVSS 3.1

4.9 medium

EPSS

<1%p29

Published

Jul 13, 2026 (Jul 13, 2026)

Modified

Jul 13, 2026

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

Vendors: mattermost
Products: mattermost server
Weakness: CWE-639
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (0.4%)

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