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SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-5gmf-x7hg-97wf)

medium Tenable Cloud Security Plugin ID 444168

Description

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

 - Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to
 filter nil elements from outgoing webhook attachment payloads before processing, which allows an
 authenticated user to cause a denial of service (server process termination) via a crafted webhook
 callback response containing a null attachment entry.. Mattermost Advisory ID: MMSA-2026-00641
 (CVE-2026-4915)

Solution

Update the github.com/mattermost/mattermost-server library and its related packages to version 10.11.15 or later.

See Also

https://github.com/advisories/GHSA-5gmf-x7hg-97wf

Plugin Details

Severity: Medium

ID: 444168

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 6/30/2026

Updated: 6/30/2026

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2026-4915

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: 5/26/2026

Vulnerability Publication Date: 5/25/2026

Reference Information

CVE: CVE-2026-4915

cwe: CWE-754