Siemens SIMATIC S7 PLC Web Server Improper Neutralization of Input During Web Page Generation (CVE-2026-25789)

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

include('compat.inc');

if (description)
{
  script_id(505540);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/15");

  script_cve_id("CVE-2026-25789");
  script_xref(name:"ICSA", value:"26-134-15");

  script_name(english:"Siemens SIMATIC S7 PLC Web Server Improper Neutralization of Input During Web Page Generation (CVE-2026-25789)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Affected devices do not properly validate and sanitize filenames on
the Firmware Update page. This could allow a remote attacker to
social engineer the user into selecting a modified firmware file.
This would result in malicious JavaScript execution in the context
of the authenticated user's session without requiring the file to
be uploaded, potentially leading to session hijacking.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-688146.html");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-26-134-15");
  script_set_attribute(attribute:"solution", value:
"The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original
can be found at CISA.gov.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-25789");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(79);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/06");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_s7-1500_cpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_et200sp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_et200pro_firmware");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

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

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Siemens");

  exit(0);
}

include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

var asset = tenable_ot::assets::get(vendor:'Siemens');

var vuln_cpes = {
    "cpe:/o:siemens:simatic_s7-1500_cpu_firmware:all" :
        {"family" : "S71500", "orderNumbers" : ['6ES7511-1AK00-0AB0', '6ES7511-1AL03-0AB0', '6ES7511-1CL03-0AB0', '6ES7511-1FK00-0AB0', '6ES7511-1FL03-0AB0', '6ES7511-1TL03-0AB0', '6ES7511-1UL03-0AB0', '6ES7512-1CM03-0AB0', '6ES7513-1AL00-0AB0', '6ES7513-1AM03-0AB0', '6ES7513-1FL00-0AB0', '6ES7513-1FM03-0AB0', '6ES7513-2GM03-0AB0', '6ES7513-2PM03-0AB0', '6ES7515-2AM00-0AB0', '6ES7515-2AN03-0AB0', '6ES7515-2FM00-0AB0', '6ES7515-2FN03-0AB0', '6ES7515-2TN03-0AB0', '6ES7515-2UN03-0AB0', '6ES7516-2GP03-0AB0', '6ES7516-2PP03-0AB0', '6ES7516-3AN00-0AB0', '6ES7516-3AP03-0AB0', '6ES7516-3FN00-0AB0', '6ES7516-3FP03-0AB0', '6ES7516-3TP10-0AB0', '6ES7516-3UP10-0AB0', '6ES7517-3AQ10-0AB0', '6ES7517-3FQ10-0AB0', '6ES7517-3TQ10-0AB0', '6ES7517-3UQ10-0AB0', '6ES7518-3AT10-0AB0', '6ES7518-3FT10-0AB0', '6ES7518-3TT10-0AB0', '6ES7518-3UT10-0AB0', '6ES7518-4AP00-3AB0', '6ES7518-4FP00-3AB0']},
    "cpe:/o:siemens:simatic_s7-1500_cpu_firmware:2.9.9" :
        {"versionEndExcluding" : "2.9.9", "family" : "S71500", "orderNumbers" : ['6ES7511-1AK01-0AB0', '6ES7511-1AK02-0AB0', '6ES7511-1CK00-0AB0', '6ES7511-1CK01-0AB0', '6ES7511-1FK01-0AB0', '6ES7511-1FK02-0AB0', '6ES7511-1TK01-0AB0', '6ES7511-1UK01-0AB0', '6ES7512-1CK00-0AB0', '6ES7512-1CK01-0AB0', '6ES7513-1AL01-0AB0', '6ES7513-1AL02-0AB0', '6ES7513-1FL01-0AB0', '6ES7513-1FL02-0AB0', '6ES7515-2AM01-0AB0', '6ES7515-2AM02-0AB0', '6ES7515-2FM01-0AB0', '6ES7515-2FM02-0AB0', '6ES7515-2TM01-0AB0', '6ES7515-2UM01-0AB0', '6ES7516-3AN01-0AB0', '6ES7516-3AN02-0AB0', '6ES7516-3FN01-0AB0', '6ES7516-3FN02-0AB0']},
    "cpe:/o:siemens:simatic_s7-1500_cpu_firmware:3.1.6" :
        {"versionEndExcluding" : "3.1.6", "family" : "S71500", "orderNumbers" : ['6ES7516-3TN00-0AB0', '6ES7516-3UN00-0AB0', '6ES7517-3AP00-0AB0', '6ES7517-3FP00-0AB0', '6ES7517-3FP01-0AB0', '6ES7517-3TP00-0AB0', '6ES7517-3UP00-0AB0', '6ES7518-4AP00-0AB0', '6ES7518-4AX00-1AB0', '6ES7518-4AX00-1AC0', '6ES7518-4FP00-0AB0', '6ES7518-4FX00-1AB0', '6ES7518-4FX00-1AC0', '6ES7518-4TP00-0AB0', '6ES7518-4UP00-0AB0', '6ES7615-4DF10-0AB0', '6ES7615-7DF10-0AB0']},
    "cpe:/o:siemens:siplus_s7-1500_cpu_firmware:all" :
        {"family" : "S71500", "orderNumbers" : ['6AG1511-1AK00-2AB0', '6AG1511-1FK00-2AB0', '6AG1513-1AL00-2AB0', '6AG1513-1FL00-2AB0', '6AG1516-3AN00-2AB0', '6AG1516-3AN00-7AB0', '6AG1516-3FN00-2AB0']},
    "cpe:/o:siemens:siplus_s7-1500_cpu_firmware:2.9.9" :
        {"versionEndExcluding" : "2.9.9", "family" : "S71500", "orderNumbers" : ['6AG1511-1AK01-2AB0', '6AG1511-1AK01-7AB0', '6AG1511-1AK02-2AB0', '6AG1511-1AK02-7AB0', '6AG1511-1FK01-2AB0', '6AG1511-1FK02-2AB0', '6AG1513-1AL01-2AB0', '6AG1513-1AL01-7AB0', '6AG1513-1AL02-2AB0', '6AG1513-1AL02-7AB0', '6AG1513-1FL01-2AB0', '6AG1513-1FL02-2AB0', '6AG1515-2FM01-2AB0', '6AG1515-2FM02-2AB0', '6AG1516-3AN01-2AB0', '6AG1516-3AN01-7AB0', '6AG1516-3AN02-2AB0', '6AG1516-3AN02-7AB0', '6AG1516-3FN01-2AB0', '6AG1516-3FN02-2AB0', '6AG2511-1AK01-1AB0', '6AG2511-1AK01-4AB0', '6AG2511-1AK02-1AB0', '6AG2511-1AK02-4AB0', '6AG2515-2FM01-2AB0', '6AG2515-2FM02-4AB0', '6AG2516-3AN01-4AB0', '6AG2516-3AN02-4AB0', '6AG2516-3FN02-2AB0', '6AG2516-3FN02-4AB0']},
    "cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.6" :
        {"versionEndExcluding" : "3.1.6", "family" : "S71500", "orderNumbers" : ['6AG1518-4AP00-4AB0', '6AG1518-4AX00-4AC0', '6AG1518-4FP00-4AB0']},
    "cpe:/o:siemens:simatic_et200sp_firmware:all" :
        {"family" : "ET200SP", "orderNumbers" : ['6AG1512-1SK00-2AB0', '6ES7510-1DJ00-0AB0', '6ES7510-1DK03-0AB0', '6ES7510-1SJ00-0AB0', '6ES7510-1SK03-0AB0', '6ES7512-1DK00-0AB0', '6ES7512-1DM03-0AB0', '6ES7512-1SK00-0AB0', '6ES7512-1SM03-0AB0', '6ES7514-2DN03-0AB0', '6ES7514-2SN03-0AB0', '6ES7514-2VN03-0AB0', '6ES7514-2WN03-0AB0']},
    "cpe:/o:siemens:simatic_et200sp_firmware:2.9.9" :
        {"versionEndExcluding" : "2.9.9", "family" : "ET200SP", "orderNumbers" : ['6AG1510-1DJ01-2AB0', '6AG1510-1DJ01-7AB0', '6AG1510-1SJ01-2AB0', '6AG1512-1DK01-2AB0', '6AG1512-1DK01-7AB0', '6AG1512-1SK01-2AB0', '6AG1512-1SK01-7AB0', '6AG2510-1DJ01-1AB0', '6AG2510-1DJ01-4AB0', '6AG2510-1SJ01-1AB0', '6AG2512-1DK01-1AB0', '6AG2512-1DK01-4AB0', '6AG2512-1SK01-1AB0', '6AG2512-1SK01-4AB0', '6ES7510-1DJ01-0AB0', '6ES7510-1SJ01-0AB0', '6ES7512-1DK01-0AB0', '6ES7512-1SK01-0AB0']},
    "cpe:/o:siemens:simatic_et200pro_firmware:2.9.9" :
        {"versionEndExcluding" : "2.9.9", "family" : "ET200", "orderNumbers" : ['6ES7513-2GL00-0AB0', '6ES7513-2PL00-0AB0', '6ES7516-2GN00-0AB0', '6ES7516-2PN00-0AB0']}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_HOLE);