๐Ÿ›ก๏ธ CVE-2026-28732
๐ŸŸก CVSS 4.3 โ€” Medium โœ… No Known Exploit CWE-863 NVD
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597

Details

Severity Medium
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CWE CWE-863
Public Exploit โœ… No
Source NVD
Published 2026-05-18
Updated 2026-06-02
Modified 2026-06-01
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/mattermost/mattermost-server โ€” โ€”
github.com/mattermost/mattermost/server/v8 โ€” โ€”
mattermost-server 11.5.0 11.5.2
unknown โ€” โ€”

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