Siemens SIMATIC S7 PLC Web Server Improper Neutralization of Input During Web Page Generation (CVE-2026-25786)

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

include('compat.inc');

if (description)
{
  script_id(505539);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/15");

  script_cve_id("CVE-2026-25786");
  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-2026-25786)");

  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 PLC/station
name rendered on the 'communication' parameters page of the web
interface. This could allow an authenticated attacker who is
authorized to download a TIA project into the product, to inject
malicious scripts into the page. If a benign user with appropriate
rights accesses the 'communication' parameters page, the malicious
code would be executed in the scope of their web session.

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:L/Au:M/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: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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/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-2026-25786");

  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);