---
cve: "CVE-2026-19601"
severity: "MEDIUM"
cvss: 4.9
epss: "0.2%"
vendor: "Mattermost"
kev: false
exploited: false
published: "2026-10-16 07:17:12"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-30T22:41:39+01:00"
---

# CVE-2026-19601

> 4.9 MEDIUM

## Beschreibung

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to invalidate the stored AD/LDAP bind password when other connection settings (such as the server address) are changed, which allows a System Console administrator to disclose the plaintext bind password to an attacker-controlled server via the Test Connection / diagnostics feature. Mattermost Advisory ID: MMSA-2026-00764

## CNA-Record (Kanon, cvelistV5)

- CNA: **Mattermost**
- State: PUBLISHED
- Stand: 2026-10-16 12:00:43
- CNA-CVSS: **4.9** (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Schwachstellen-Klasse

- **CWE-201** — Insertion of Sensitive Information Into Sent Data
  The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.

## Angriffsmuster (CAPEC)

- [CAPEC-12 — Choosing Message Identifier](https://capec.mitre.org/data/definitions/12.html) _(Severity: High)_
- [CAPEC-217 — Exploiting Incorrectly Configured SSL/TLS](https://capec.mitre.org/data/definitions/217.html)
- [CAPEC-612 — WiFi MAC Address Tracking](https://capec.mitre.org/data/definitions/612.html) _(Severity: Low)_
- [CAPEC-613 — WiFi SSID Tracking](https://capec.mitre.org/data/definitions/613.html) _(Severity: Low)_
- [CAPEC-618 — Cellular Broadcast Message Request](https://capec.mitre.org/data/definitions/618.html) _(Severity: Low)_
- [CAPEC-619 — Signal Strength Tracking](https://capec.mitre.org/data/definitions/619.html) _(Severity: Low)_
- [CAPEC-621 — Analysis of Packet Timing and Sizes](https://capec.mitre.org/data/definitions/621.html) _(Severity: Low)_
- [CAPEC-622 — Electromagnetic Side-Channel Attack](https://capec.mitre.org/data/definitions/622.html) _(Severity: Low)_

## BSI-Hinweise (deutsch)

- [Mattermost: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-4009) — _BSI-Einstufung: mittel_
  Ein Angreifer kann mehrere Schwachstellen in Mattermost ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren.

## Referenzen

- <https://mattermost.com/security-updates>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-19601/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_