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Full vulnerability report · 2026
CVE-2026-25786High confidence

This could allow an authenticated attacker who is authorized to download a TIA project into the product, to inject malicious scripts into the page

Siemens · SIMATIC Drive Controller CPU 1504D TF

9.3CriticalCVSS 4.0
Recommended action
Within 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
SSA-688146 · CSAF 2.0 · revision 2 · interimSiemens ProductCERTSSA-688146: Multiple Cross-Site Scripting Vulnerabilities in SIMATIC S7 PLCs Web Server
175 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • SIMATIC Drive Controller CPU 1504D TF (6ES7615-4DF10-0AB0) < V3.1.6
  • SIMATIC Drive Controller CPU 1507D TF (6ES7615-7DF10-0AB0) < V3.1.6
  • SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ00-0AB0)
  • SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ01-0AB0) < V2.9.9
  • SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SK03-0AB0) < V4.1.6
  • SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DJ00-0AB0)
  • SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DJ01-0AB0) < V2.9.9
  • SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DK03-0AB0) < V4.1.6
  • SIMATIC ET 200SP CPU 1512SP F-1 PN (6ES7512-1SK00-0AB0)
  • SIMATIC ET 200SP CPU 1512SP F-1 PN (6ES7512-1SK01-0AB0) < V2.9.9
  • SIMATIC ET 200SP CPU 1512SP F-1 PN (6ES7512-1SM03-0AB0) < V4.1.6
  • SIMATIC ET 200SP CPU 1512SP-1 PN (6ES7512-1DK00-0AB0)
Summary
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.
Remediation
Update to V2.9.9 or later version
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-29426

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
High: elevated access is required
User interaction
Passive interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-79 ↗

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
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

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UIPassiveUser interaction: A user must unknowingly interact with the vulnerable system.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCHighSubsequent-system confidentiality: A successful attack can cause a major loss.SIHighSubsequent-system integrity: A successful attack can cause a major loss.SAHighSubsequent-system availability: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-79
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-W-2026-1474Siemens SIMATIC S7 PLCs Web Server: Mehrere Schwachstellen ermöglichen Cross-Site Scripting

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Siemens SIMATIC S7 PLCs Web Server ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0565Multiples vulnérabilités dans les produits Siemens

e que le produit ne bénéficiera pas de correctif de sécurité pour la vulnérabilité CVE-2025-40833. SIMATIC ET 200S IM 151-8F PN/DP CPU (6ES7151-8FB01-0AB0) toutes versions. L'éditeur indique que le produit ne bénéficiera pas de correctif de sécurité pour la vulnérabilité CVE-2025-40833. SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ00-0AB0) toutes versions. L'éditeur indique que le produit ne bénéficiera pas de correctif de sécurité pour la vulnérabilité CVE-2025-40833. SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ00-0AB0) toutes versions. L'éditeur indique que le produit ne bénéficiera pas de correctif de sécurité pour les vulnérabilités CVE-2026-25786, CVE-2026-25787 et CVE-2026-25789. SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ01-0AB0) versions antérieures à 2.9.9 SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SK03-0AB0) toutes versions pour les vulnérabilités CVE-2026-25786, CVE-2026-25787 et CVE-2026-25789. SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DJ00-0AB0) toutes versions. L'éditeur indique que le produit ne bénéficiera pas de correctif de sécurité pour la vulnérabilité CVE-2025-40833. SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DJ00-0AB0) toutes versions. L'éditeur indique que le produit ne bénéficiera pas de correctif de sécurité pour les vulnérabilités CVE-2026-25786, CVE-2026-

Official advisory
NCSC-NL · Dutch · NCSC-2026-0147Kwetsbaarheden verholpen in Siemens-producten

Certain devices fail to properly validate and sanitize PLC/station names on the web interface's communication parameters page, enabling authenticated users with project download rights to inject malicious scripts executed upon page access by legitimate users.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
SIMATIC Drive Controller CPU 1504D TF (6ES7615-4DF10-0AB0) < V3.1.6; SIMATIC Drive Controller CPU 1507D TF (6ES7615-7DF10-0AB0) < V3.1.6; SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ00-0AB0); SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SJ01-0AB0) < V2.9.9; SIMATIC ET 200SP CPU 1510SP F-1 PN (6ES7510-1SK03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DJ00-0AB0); SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DJ01-0AB0) < V2.9.9; SIMATIC ET 200SP CPU 1510SP-1 PN (6ES7510-1DK03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1512SP F-1 PN (6ES7512-1SK00-0AB0); SIMATIC ET 200SP CPU 1512SP F-1 PN (6ES7512-1SK01-0AB0) < V2.9.9; SIMATIC ET 200SP CPU 1512SP F-1 PN (6ES7512-1SM03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1512SP-1 PN (6ES7512-1DK00-0AB0); SIMATIC ET 200SP CPU 1512SP-1 PN (6ES7512-1DK01-0AB0) < V2.9.9; SIMATIC ET 200SP CPU 1512SP-1 PN (6ES7512-1DM03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1514SP F-2 PN (6ES7514-2SN03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1514SP-2 PN (6ES7514-2DN03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1514SPT F-2 PN (6ES7514-2WN03-0AB0) < V4.1.6; SIMATIC ET 200SP CPU 1514SPT-2 PN (6ES7514-2VN03-0AB0) < V4.1.6; SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants); SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) V2 CPUs; SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) V3 CPUs; SIMATIC ET 200SP Open Controller CPU 1515SP PC3 V4 CPUs; SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK00-0AB0); SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK01-0AB0) < V2.9.9; SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK02-0AB0) < V2.9.9; SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AL03-0AB0) < V4.1.6; SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CK00-0AB0) < V2.9.9; SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CK01-0AB0) < V2.9.9; SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CL03-0AB0) < V4.1.6; SIMATIC S7-1500 CPU 1511F-1 PN (6ES7511-1FK00-0AB0); and 145 more
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
Update to V2.9.9 or later version
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 12 May 2026 · Last source change 14 Jul 2026, 09:19 UTC · CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-29426
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-29426↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-25786 · cve.blacktree.nl