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Full vulnerability report · 2026
CVE-2026-25789High confidence

This could allow a remote attacker to social engineer the user into selecting the modified firmware file to be uploaded

Siemens · SIMATIC Drive Controller CPU 1504D TF

Official source article: Siemens SSA-688146 ↗. Check the applicable product and release in the original source.

7.2HighCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 175 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.47% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Siemens SIMATIC Drive Controller CPU 1504D TF and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 175 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

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 filenames on the Firmware Update page. This could allow a remote attacker to social engineer the user into selecting the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.
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.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

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-2026-29428

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 actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 175 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

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 the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.

What

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 the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.

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 low 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 filenames on the Firmware Update page. This could allow a remote attacker to social engineer the user into selecting the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.

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 low 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
Low: a basic authenticated account is required
User interaction
Active interaction required
Attack complexity
High: exploitation depends on specific conditions
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:H/AT:P/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRLowPrivileges required: The attacker needs basic user-level privileges.UIActiveUser interaction: A user must take a deliberate action for exploitation to succeed.VCLowVulnerable-system confidentiality: A successful attack can cause a limited loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCLowSubsequent-system confidentiality: A successful attack can cause a limited 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
Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
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-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

s 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-2026-25787 et CVE-2026-25789. SIMATIC E

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

Certain devices fail to properly validate filenames on their Firmware Update page, allowing remote attackers to execute malicious JavaScript through social engineering, potentially leading to session hijacking or credential theft.

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.
Fix availability varies by product
Affected
Fixed
Update to V2.9.9 or later version
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
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-2026-29428
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 ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    < V3.1.6; < *; < V2.9.9; < V4.1.6 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    < V3.1.6; < *; < V2.9.9; < V4.1.6 · Fixed: Update to V2.9.9 or later version
    Siemens ProductCERT ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Siemens ProductCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-29428↗CVE authority or vendor reference · Siemens SSA-688146↗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-2026-25789 · cve.blacktree.nl