---
cve: "CVE-2026-3869"
severity: "CRITICAL"
cvss: 9.2
epss: "0.5%"
vendor: "Schneider Electric"
kev: false
exploited: false
published: "2026-09-11 16:17:06"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T17:21:55+02:00"
---

# CVE-2026-3869

> 9.2 CRITICAL

## Beschreibung

CWE-303 : Incorrect Implementation of Authentication Algorithm vulnerability exists that could cause loss of confidentiality, integrity and availability of the PLC provided an application project with a lower application level is running on the PLC.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

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

## Schwachstellen-Klasse

- **CWE-303** — Incorrect Implementation of Authentication Algorithm
  The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.

## Angriffsmuster (CAPEC)

- [CAPEC-90 — Reflection Attack in Authentication Protocol](https://capec.mitre.org/data/definitions/90.html) _(Severity: High)_

## Referenzen

- <https://download.se.com/files?p_Doc_Ref=SEVD-2026-251-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-251-04.pdf>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-3869) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_