Mattermost 11.7.2/11.6.4/10.11.19 Bypass in /share-channel Autocomplete
CVE-2026-9824 Published on July 13, 2026

Remote cluster metadata enumeration via /share-channel autocomplete
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-9824 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Type

What is an AuthZ Vulnerability?

The software does not perform an authorization check when an actor attempts to access a resource or perform an action.

CVE-2026-9824 has been classified to as an AuthZ vulnerability or weakness.


Products Associated with CVE-2026-9824

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Affected Versions

Mattermost: