Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-wvcv-9xpm-7mqc)

medium Tenable Self-Hosted Container Security Plugin ID 442560

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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 (CVE-2026-28732)

Solution

Update the github.com/mattermost/mattermost/server/v8 library and its related packages to version 10.11.14 or later.

See Also

https://github.com/advisories/GHSA-wvcv-9xpm-7mqc

Plugin Details

Severity: Medium

ID: 442560

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 6/2/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS Score Source: CVE-2026-28732

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/18/2026

Vulnerability Publication Date: 5/18/2026

Reference Information

CVE: CVE-2026-28732

cwe: CWE-863