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CVE.org (no NVD analysis yet)· CNA siemens

CVE-2026-63353: Affected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page.

CriticalCVSS 9.4 · v4.0—No exploit No fix recorded

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: 0.31% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is 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 sanitize comment fields contained in imported trace files before rendering them on the Trace page. This could allow an attacker to social engineer an authorized user who holds the function right “Read diagnostics” into importing a specially crafted trace file. Successful exploitation could allow attacker-controlled JavaScript to execute in the user’s browser session and perform PLC operations through the web server within the scope of the user’s authorization.

Published
Oct 13, 2026
Updated
Oct 15, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
37 / 40 · 9.4 / 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
9.6
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-2026-63353

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

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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

    • all versionsaffected

  • Siemens SIMATIC Drive Controller CPU 1507D TF

    • all versionsaffected

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

    • all versionsaffected
    • all versionsaffected

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

    • all versionsaffected
    • all versionsaffected

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

    • all versionsaffected
    • all versionsaffected

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

    • all versionsaffected
    • all versionsaffected

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

    • all versionsaffected

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

    • all versionsaffected

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

    • all versionsaffected

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

    • all versionsaffected

  • 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 - Windows OS

    • 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…
    37Monitor
  • CVE-2026-63350Affected devices do not properly restrict executable content contained in imported trace files.
    37Monitor
  • CVE-2026-25787Affected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" page of the…
    37Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-63351Oct 13, 2026 · Affected devices do not properly validate and sanitize visual properties of calculated signals contained in imported CSV trace files before…
    21Monitor
  • ← EarlierCVE-2026-63352Oct 13, 2026 · Affected devices do not properly sanitize calculated signal data contained in imported CSV trace files before rendering it on the Trace…
    21Monitor
  • Later →CVE-2026-63355Oct 13, 2026 · Affected devices do not properly sanitize signal names contained in imported CSV trace files before rendering them in selection menus on…
    21Monitor

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).

Variant candidates

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

  • CVE-2026-633540 days apartAffected devices do not properly validate and sanitize visual marker data contained in imported CSV trace files before rendering it on the…
    37Monitor
  • CVE-2026-25786154 days apartAffected devices do not properly validate and sanitize PLC/station name rendered on the "communication" parameters page of the web…
    37Monitor
  • CVE-2026-25787154 days apartAffected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" page of the…
    37Monitor
  • CVE-2026-25789154 days apartAffected devices do not properly validate and sanitize filenames on the Firmware Update page.
    28Monitor
  • CVE-2026-633520 days apartAffected devices do not properly sanitize calculated signal data contained in imported CSV trace files before rendering it on the Trace…
    21Monitor
  • CVE-2026-633550 days apartAffected devices do not properly sanitize signal names contained in imported CSV trace files before rendering them in selection menus on…
    21Monitor

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
A
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:N/UI:A/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

  1. SSVC exploitation— → none
  2. Exploit maturity— → none
  3. CVSS9.6 → 9.4

For records you follow, these changes also arrive as notifications. →

References

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

All records