SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-rp4v-qc77-phm4)

medium Tenable Self-Hosted Container Security Plugin ID 446257

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
restrict role_updated websocket event broadcasts to members of the affected team or channel which allows
an authenticated attacker with guest-level access to observe permission scheme change notifications for
private teams they are not a member of via the websocket connection.. Mattermost Advisory ID:
MMSA-2026-00616 (CVE-2026-3433)

Solution

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

Plugin Details

Severity: Medium

ID: 446257

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/25/2026

Updated: 8/25/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-3433

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-2026-3433

cwe: CWE-200

Detections

Analytics