Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-cjm8-jxpw-g43m)

medium Tenable Cloud Security Plugin ID 442561

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 validate 7zip archive
 structure before processing which allows an authenticated attacker to cause server memory exhaustion and
 denial of service via uploading a specially crafted 7zip file with excessive folder declarations..
 Mattermost Advisory ID: MMSA-2026-00573 (CVE-2026-6340)

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-cjm8-jxpw-g43m

Plugin Details

Severity: Medium

ID: 442561

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: 3

Percentile: 23.71

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-6340

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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-2026-6340

cwe: CWE-789