Mattermost Server 9.11.x < 9.11.17 / 10.5.x < 10.5.7 / 10.7.x < 10.7.4 / 10.8.x < 10.8.2 (MMSA-2025-00490)

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

include('compat.inc');

if (description)
{
  script_id(242670);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/21");

  script_cve_id("CVE-2025-6226");
  script_xref(name:"IAVA", value:"2025-A-0538-S");

  script_name(english:"Mattermost Server 9.11.x < 9.11.17 / 10.5.x < 10.5.7 / 10.7.x < 10.7.4 / 10.8.x < 10.8.2  (MMSA-2025-00490)");

  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-2025-00490 advisory.

  - Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to
    verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user
    to read posts in private channels they don't have access to via guessing the PendingPostID of recently
    created posts. (CVE-2025-6226)

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 9.11.17 / 10.5.7 / 10.7.4 / 10.8.2 / 10.9.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:N/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-6226");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/24");

  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' : '9.11.17' },
  { 'min_version' : '10.5.0', 'fixed_version' : '10.5.7' },
  { 'min_version' : '10.7.0', 'fixed_version' : '10.7.4' },
  { 'min_version' : '10.8.0', 'fixed_version' : '10.8.2', 'fixed_display' : '10.8.2 / 10.9.0' }
];

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