Detections
Analytics

Mattermost Server 9.11.x < 9.11.9 / 10.3.x < 10.3.4 / 10.4.x < 10.4.3 (MMSA-2025-00418)

medium Nessus Plugin ID 233453

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Synopsis

The remote host is missing a security update.

Description

The version of Mattermost Server installed on the remote host is prior to 9.11.9, 10.3.4, or 10.4.3. It is, therefore, affected by a vulnerability as referenced in the _MMSA-2025-00418 advisory.

 - Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public (CVE-2025-27933)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Mattermost Server version 9.11.9 / 10.3.4 / 10.4.3 / 10.5.0 or later.

See Also

https://mattermost.com/security-updates/

Plugin Details

Severity: Medium

ID: 233453

File Name: mattermost_server_MMSA-2025-00418.nasl

Version: 1.1

Type: remote

Family: CGI abuses

Published: 3/28/2025

Updated: 3/28/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.1

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

CVSS Score Source: CVE-2025-27933

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mattermost:mattermost_server

Required KB Items: installed_sw/Mattermost Server

Exploit Ease: No known exploits are available

Patch Publication Date: 2/19/2025

Vulnerability Publication Date: 3/21/2025

Reference Information

CVE: CVE-2025-27933

IAVA: 2025-A-0195