Detections
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SCA: security update for github.com/mattermost/mattermost-server (GHSA-mxxh-fmjq-j6x4)

low Tenable Self-Hosted Container Security Plugin ID 440959

Description

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

 - Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct
 Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces
 feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost
 Advisory ID: MMSA-2026-00603 (CVE-2026-27769)

Solution

Update the github.com/mattermost/mattermost-server library and its related packages to version 8.0.0-20260316060126-bc1a2b34b1f9 or later.

See Also

https://github.com/advisories/GHSA-mxxh-fmjq-j6x4

Plugin Details

Severity: Low

ID: 440959

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 4/29/2026

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: Low

CVSS v2

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

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

CVSS Score Source: CVE-2026-27769

CVSS v3

Risk Factor: Low

Base Score: 2.7

Temporal Score: 2.4

Vector: CVSS:3.0/AV:N/AC:L/PR:H/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: 4/17/2026

Vulnerability Publication Date: 4/15/2026

Reference Information

CVE: CVE-2026-27769

cwe: CWE-862