SolarWinds Serv-U 15.5.4 < 2026.3 Multiple Vulnerabilities XSS

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

include('compat.inc');

if (description)
{
  script_id(328845);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/24");

  script_cve_id(
    "CVE-2026-28309",
    "CVE-2026-28310",
    "CVE-2026-28313",
    "CVE-2026-28314",
    "CVE-2026-28315"
  );
  script_xref(name:"IAVA", value:"2026-A-0759");

  script_name(english:"SolarWinds Serv-U 15.5.4 < 2026.3 Multiple Vulnerabilities XSS");

  script_set_attribute(attribute:"synopsis", value:
"SolarWinds Serv-U is affected by a vulnerability");
  script_set_attribute(attribute:"description", value:
"The version of SolarWinds Serv-U installed on the remote host is prior to 2026.3. It is, therefore, affected by multiple
vulnerabilities as referenced in the solarwinds_serv-u_2026_3 advisory.

  - SolarWinds Serv-U was found to be affected by a stored cross-site scripting vulnerability that could lead
    to session hijacking or information disclosure from an administrator account. (CVE-2026-28315)

  - SolarWinds Serv-U is affected by an insecure direct object reference vulnerability that leads to an
    account takeover. User authentication is required. The impact is lower in Windows deployments.
    (CVE-2026-28314)

  - SolarWinds Serv-U is affected by a broken access control vulnerability that allows a domain administrator
    to create system administrator accounts. The impact is lower in Windows deployments. (CVE-2026-28309)

  - SolarWinds Serv-U is affected by a privilege escalation vulnerability that allows a domain administrator
    to escalate their user type to that of a system administrator. The impact is lower in Windows deployments.
    (CVE-2026-28310)

  - SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to
    SMTP hijacking leading to arbitrary account takeover. The impact is lower in Windows deployments.
    (CVE-2026-28313)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28309
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?37a766ab");
  # https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28310
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0166d6c5");
  # https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28313
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ce6272ed");
  # https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28314
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?450d2761");
  # https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28315
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3add141a");
  script_set_attribute(attribute:"solution", value:
"Upgrade to SolarWinds Serv-U version 2026.3 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-28315");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-28314");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:solarwinds:serv-u");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:solarwinds:serv-u_file_server");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:serv-u:serv-u");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"FTP");

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

  script_dependencies("servu_version.nasl");
  script_require_keys("installed_sw/Serv-U");

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');
include('ftp_func.inc');

var port = get_ftp_port(default:21);

var app_info = vcf::get_app_info(app:'Serv-U', port:port);

var constraints = [
  { 'min_version' : '15.5.4', 'max_version' : '15.5.4 HF1', 'fixed_version' : '2026.3' }
];
vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_WARNING,
    flags:{'xss':TRUE}
);