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

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(264624);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/21");

  script_cve_id("CVE-2025-53971");
  script_xref(name:"IAVA", value:"2025-A-0629-S");

  script_name(english:"Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00485)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"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.");
  script_set_attribute(attribute:"see_also", value:"https://mattermost.com/security-updates/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Mattermost Server version 9.11.18, 10.5.9, 10.10.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:P/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-53971");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/08/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/08/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/12");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:mattermost:mattermost_server");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("mattermost_server_detect.nbin");
  script_require_keys("installed_sw/Mattermost Server");

  exit(0);
}

include('vcf.inc');
include('http.inc');

var port = get_http_port(default:80);

var app_info = vcf::get_app_info(app:'Mattermost Server', port:port, webapp:true);

var constraints = [
  { 'min_version' : '9.11.0', 'fixed_version' : '9.11.18' },
  { 'min_version' : '10.5.0', 'fixed_version' : '10.5.9', 'fixed_display' : '10.5.9 / 10.10.0' }
];

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_WARNING
);