Detections
Analytics

Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00485)

low Nessus Plugin ID 264624

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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 affected by a vulnerability as referenced in the MMSA-2025-00485 advisory.

 - Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint. (CVE-2025-53971)

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 9.11.18, 10.5.9, 10.10.0 or later.

See Also

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

Plugin Details

Severity: Low

ID: 264624

File Name: mattermost_server_MMSA-2025-00485.nasl

Version: 1.1

Type: remote

Family: CGI abuses

Published: 9/12/2025

Updated: 9/12/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

CVSS v2

Risk Factor: Medium

Base Score: 4.7

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

CVSS Score Source: CVE-2025-53971

CVSS v3

Risk Factor: Low

Base Score: 3.8

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

Vulnerability Information

CPE: cpe:/a:mattermost:mattermost_server

Required KB Items: installed_sw/Mattermost Server

Patch Publication Date: 8/21/2025

Vulnerability Publication Date: 8/21/2025

Reference Information

CVE: CVE-2025-53971

IAVA: 2025-A-0629