Security Updates for Microsoft Exchange Server (June 2026)

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

include('compat.inc');

if (description)
{
  script_id(320863);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/12");

  script_cve_id(
    "CVE-2026-42897",
    "CVE-2026-45500",
    "CVE-2026-45501",
    "CVE-2026-45502",
    "CVE-2026-45503",
    "CVE-2026-45504",
    "CVE-2026-45583",
    "CVE-2026-47631",
    "CVE-2026-48579"
  );
  script_xref(name:"MSFT", value:"MS26-5094139");
  script_xref(name:"MSFT", value:"MS26-5094140");
  script_xref(name:"MSFT", value:"MS26-5094142");
  script_xref(name:"MSFT", value:"MS26-5094144");
  script_xref(name:"MSKB", value:"5094139");
  script_xref(name:"MSKB", value:"5094140");
  script_xref(name:"MSKB", value:"5094142");
  script_xref(name:"MSKB", value:"5094144");
  script_xref(name:"IAVA", value:"2026-A-0572");

  script_name(english:"Security Updates for Microsoft Exchange Server (June 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Exchange Server installed on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Exchange Server installed on the remote host is missing a security update. It is, therefore, affected by
multiple vulnerabilities as referenced in the June, 2026 security bulletin.

  - Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange
    Server allows an unauthorized attacker to perform spoofing over a network. (CVE-2026-45500,
    CVE-2026-45501, CVE-2026-47631)

  - Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose
    information over a network. (CVE-2026-48579)

  - Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an
    unauthorized attacker to execute code over a network. (CVE-2026-45583)

  - Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose
    information over a network. (CVE-2026-45502, CVE-2026-45503)

  - Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate
    privileges over a network. (CVE-2026-45504)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-subscription-edition-rtm-june-09-2026-kb5094139-d9713301-1e65-40f9-a14a-2c7b8ae711d1
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?496cae11");
  # https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-cu15-june-09-2026-kb5094140-87cde12f-2657-4c21-b587-15383cab1137
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6823ab4e");
  # https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-cu14-june-09-2026-kb5094142-199c2365-df8e-4dfe-9f43-fc741c13949d
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3b89f8a8");
  # https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2016-cu23-june-09-2026-kb5094144-5c4aee4a-6c0e-42af-a2ed-fc23a10ce543
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?629d2e81");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  -KB5094139
  -KB5094140
  -KB5094142
  -KB5094144");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-47631");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-45583");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:exchange_server:2016");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:exchange_server:2019");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:exchange_server:subscription_edition");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

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

  script_dependencies("ms_bulletin_checks_possible.nasl", "microsoft_exchange_installed.nbin");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

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

var app_info = vcf::microsoft::exchange::get_app_info();

var constraints = [
  { 'fixed_version' : '15.1.2507.69', 'product' : '2016', 'cu' : 23, 'unsupported_cu' : 22, 'kb' : '5094144' },
  { 'fixed_version' : '15.2.1544.41', 'product' : '2019', 'cu' : 14, 'unsupported_cu' : 13, 'kb' : '5094142' },
  { 'fixed_version' : '15.2.1748.46', 'product' : '2019', 'cu' : 15, 'unsupported_cu' : 13, 'kb' : '5094140' },
  { 'fixed_version' : '15.2.2562.43', 'product' : 'Subscription Edition',  'cu' : 0, 'kb' : '5094139'  }
];

vcf::microsoft::exchange::check_version_and_report(
  app_info:app_info,
  bulletin:'MS26-06',
  constraints:constraints,
  severity:SECURITY_HOLE
);