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NVD / CVE Program· CNA siemens

CVE-2026-25786: Affected devices do not properly validate and sanitize PLC/station name rendered on the "communication" parameters page of the web interface

Noroxi assessment

Priority: Monitor (action score 37/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.37% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.3 · v4.0—No exploit No fix recorded
Published
May 12, 2026
Updated
Jul 14, 2026
EPSS
0.3% · 30th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · siemens
9.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-25786

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Versions reported by the vendor

Affected version ranges reported by the assigning authority (siemens). Independent of NVD's CPE analysis and usually ahead of it.

  • Siemens SIMATIC Drive Controller CPU 1504D TF

    • before V3.1.6affected

  • Siemens SIMATIC Drive Controller CPU 1507D TF

    • before V3.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1510SP F-1 PN

    • all versionsaffected
    • before V2.9.9affected
    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1510SP-1 PN

    • all versionsaffected
    • before V2.9.9affected
    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1512SP F-1 PN

    • all versionsaffected
    • before V2.9.9affected
    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1512SP-1 PN

    • all versionsaffected
    • before V2.9.9affected
    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1514SP F-2 PN

    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1514SP-2 PN

    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1514SPT F-2 PN

    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP CPU 1514SPT-2 PN

    • before V4.1.6affected

  • Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants)

    • all versionsaffected

  • Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) V2 CPUs

    • all versionsaffected

Same product

siemens: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-63354Affected devices do not properly validate and sanitize visual marker data contained in imported CSV trace files before rendering it on the T
    37Monitor
  • CVE-2026-63353Affected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page.
    37Monitor
  • CVE-2026-63350Affected devices do not properly restrict executable content contained in imported trace files.
    37Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2023-37482Feb 11, 2025 · The login functionality of the web server in affected devices does not normalize the response times of login attempts.
    27Monitor
  • ← EarlierCVE-2025-40943Mar 10, 2026 · Affected devices do not properly sanitize contents of trace files.
    37Monitor
  • Later →CVE-2026-25787May 12, 2026 · Affected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" page of the
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-257870 days apartAffected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" page of the
    37Monitor
  • CVE-2026-63353154 days apartAffected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page.
    37Monitor
  • CVE-2026-63354154 days apartAffected devices do not properly validate and sanitize visual marker data contained in imported CSV trace files before rendering it on the T
    37Monitor
  • CVE-2026-257890 days apartAffected devices do not properly validate and sanitize filenames on the Firmware Update page.
    28Monitor
  • CVE-2026-63355154 days apartAffected devices do not properly sanitize signal names contained in imported CSV trace files before rendering them in selection menus on the
    21Monitor
  • CVE-2026-63356154 days apartAffected devices do not properly sanitize calculated signal names contained in imported CSV trace files before including them in error messa
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
P
Scope
X

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records