Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-34g8-9fpp-46ch)

medium Tenable Self-Hosted Container Security Plugin ID 438918

Description

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

 - Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the
 size of responses from integration action endpoints, which allows an authenticated attacker to cause
 server memory exhaustion and denial of service via a malicious integration server that returns an
 arbitrarily large response when a user clicks an interactive message button.. Mattermost Advisory ID:
 MMSA-2026-00571 (CVE-2026-2456)

Solution

Update the github.com/mattermost/mattermost-server library and its related packages to version 10.11.11 or later.

See Also

https://github.com/advisories/GHSA-34g8-9fpp-46ch

Plugin Details

Severity: Medium

ID: 438918

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 3/18/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

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-2026-2456

CVSS v3

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/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: 3/16/2026

Vulnerability Publication Date: 3/16/2026

Reference Information

CVE: CVE-2026-2456

cwe: CWE-789