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
References
| Link | Resource |
|---|---|
| https://mattermost.com/security-updates | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
19 May 2026, 17:18
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
| First Time |
Mattermost mattermost Server
Mattermost |
|
| References | () https://mattermost.com/security-updates - Vendor Advisory |
18 May 2026, 09:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-18 09:16
Updated : 2026-05-19 17:18
NVD link : CVE-2026-28732
Mitre link : CVE-2026-28732
CVE.ORG link : CVE-2026-28732
JSON object : View
Products Affected
mattermost
- mattermost_server
CWE
CWE-863
Incorrect Authorization