Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-3vmp-whvv-5v9v)

medium Tenable Cloud Security Plugin ID 446261

Description

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

 - Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to
 validate that a username returned during bot registration belongs to a bot account, which allows an
 unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-
 registering a user account with a predictable plugin bot username.. Mattermost Advisory ID:
 MMSA-2026-00649 (CVE-2026-6046)

Solution

Update the github.com/mattermost/mattermost-server library and its related packages to version 10.11.17 or later.

See Also

https://github.com/advisories/GHSA-3vmp-whvv-5v9v

Plugin Details

Severity: Medium

ID: 446261

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/25/2026

Updated: 8/25/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.76

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

CVSS Score Source: CVE-2026-6046

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/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: 6/12/2026

Vulnerability Publication Date: 6/12/2026

Reference Information

CVE: CVE-2026-6046

cwe: CWE-200