---
cve: "CVE-2026-89209"
severity: "HIGH"
cvss: 7.6
epss: ""
vendor: "Siemens"
kev: false
exploited: false
published: "2026-10-26 11:16:38"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-11-01T21:21:45+01:00"
---

# CVE-2026-89209

> 7.6 HIGH

## Beschreibung

A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 11 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 9 compatible) (All versions < V3.6.29). Affected versions of the module do not properly protect against SAML assertion replay in IdP-initiated authentication flows. This could allow unauthenticated remote attackers to gain unauthorized access to the application by replaying a valid SAML response.

## CNA-Record (Kanon, cvelistV5)

- CNA: **siemens**
- State: PUBLISHED
- Stand: 2026-10-31 01:13:36
- CNA-CVSS: **6.8** (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N`)

## 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:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
```

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

## Schwachstellen-Klasse

- **CWE-294** — Authentication Bypass by Capture-replay
  A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

## Angriffsmuster (CAPEC)

- [CAPEC-60 — Reusing Session IDs (aka Session Replay)](https://capec.mitre.org/data/definitions/60.html) _(Severity: High)_
- [CAPEC-102 — Session Sidejacking](https://capec.mitre.org/data/definitions/102.html) _(Severity: High)_
- [CAPEC-509 — Kerberoasting](https://capec.mitre.org/data/definitions/509.html) _(Severity: High)_
- [CAPEC-555 — Remote Services with Stolen Credentials](https://capec.mitre.org/data/definitions/555.html) _(Severity: Very High)_
- [CAPEC-561 — Windows Admin Shares with Stolen Credentials](https://capec.mitre.org/data/definitions/561.html)
- [CAPEC-644 — Use of Captured Hashes (Pass The Hash)](https://capec.mitre.org/data/definitions/644.html) _(Severity: High)_
- [CAPEC-645 — Use of Captured Tickets (Pass The Ticket)](https://capec.mitre.org/data/definitions/645.html) _(Severity: High)_
- [CAPEC-652 — Use of Known Kerberos Credentials](https://capec.mitre.org/data/definitions/652.html) _(Severity: High)_

## ATT&CK-Techniken

- [T1134.001 — Access Token Manipulation:Token Impersonation/Theft](https://attack.mitre.org/techniques/T1134/001/)
- [T1550.004 — Use Alternate Authentication Material:Web Session Cookie](https://attack.mitre.org/techniques/T1550/004/)
- [T1558.003 — Steal or Forge Kerberos Tickets:Kerberoasting](https://attack.mitre.org/techniques/T1558/003/)
- [T1021 — Remote Services](https://attack.mitre.org/techniques/T1021/)
- [T1114.002 — Email Collection:Remote Email Collection](https://attack.mitre.org/techniques/T1114/002/)
- [T1133 — External Remote Services](https://attack.mitre.org/techniques/T1133/)
- [T1021.002 — Remote Services:SMB/Windows Admin Shares](https://attack.mitre.org/techniques/T1021/002/)
- [T1550.002 — Use Alternate Authentication Material:Pass The Hash](https://attack.mitre.org/techniques/T1550/002/)
- [T1550.003 — Use Alternate Authentication Material:Pass The Ticket](https://attack.mitre.org/techniques/T1550/003/)
- [T1558 — Steal or Forge Kerberos Tickets](https://attack.mitre.org/techniques/T1558/)

## Referenzen

- <https://cert-portal.siemens.com/productcert/html/ssa-137528.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-89209/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_