---
cve: "CVE-2026-63354"
severity: "CRITICAL"
cvss: 9.4
epss: "0.3%"
vendor: "Siemens"
kev: false
exploited: false
published: "2026-10-13 10:17:18"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-08T20:26:25+01:00"
---

# CVE-2026-63354

> 9.4 CRITICAL

## Beschreibung

Affected devices do not properly validate and sanitize visual marker data contained in imported CSV trace files before rendering it 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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **siemens**
- State: PUBLISHED
- Stand: 2026-10-16 17:18:18
- CNA-CVSS: **9.6** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Schwachstellen-Klasse

- **CWE-79** — Improper Neutralization of Input During Web Page Generation
  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.

## Angriffsmuster (CAPEC)

- [CAPEC-63 — Cross-Site Scripting (XSS)](https://capec.mitre.org/data/definitions/63.html) _(Severity: Very High)_
- [CAPEC-85 — AJAX Footprinting](https://capec.mitre.org/data/definitions/85.html) _(Severity: Low)_
- [CAPEC-209 — XSS Using MIME Type Mismatch](https://capec.mitre.org/data/definitions/209.html) _(Severity: Medium)_
- [CAPEC-588 — DOM-Based XSS](https://capec.mitre.org/data/definitions/588.html) _(Severity: Very High)_
- [CAPEC-591 — Reflected XSS](https://capec.mitre.org/data/definitions/591.html) _(Severity: Very High)_
- [CAPEC-592 — Stored XSS](https://capec.mitre.org/data/definitions/592.html) _(Severity: Very High)_

## BSI-Hinweise (deutsch)

- [Siemens SIMATIC S7: Mehrere Schwachstelle](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3891) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in verschiedenen Siemens SIMATIC S7 Produkten ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Daten zu manipulieren oder offenzulegen, Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand auszulösen oder andere, nicht näher spezifizierte Angriffe durchzuführen.

## Referenzen

- <https://cert-portal.siemens.com/productcert/html/ssa-591731.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-63354/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_