---
cve: "CVE-2026-81846"
severity: "LOW"
cvss: 3.5
epss: "0.3%"
vendor: "runZero"
kev: false
exploited: false
published: "2026-09-01 19:17:28"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-11-06T23:57:11+01:00"
---

# CVE-2026-81846

> 3.5 LOW

## Beschreibung

An authorization bypass in the runZero Platform MCP service has been resolved in version 5.1.260826.0. This issue is an instance of CWE-639: Authorization Bypass Through User-Controlled Key and has an estimated CVSS score of CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N (3.5 Low).

## CNA-Record (Kanon, cvelistV5)

- CNA: **runZero**
- State: PUBLISHED
- Stand: 2026-09-01 19:36:40
- CNA-CVSS: **3.5** (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/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:H/PR:L/UI:N/S:C/C:L/I:N/A:N
```

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

## Schwachstellen-Klasse

- **CWE-639** — Authorization Bypass Through User-Controlled Key
  The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

## Referenzen

- <https://www.runzero.com/advisories/runzero-mcp-findings-summaries-data-leak-cve-2026-81846>
- <https://help.runzero.com/docs/release-notes/#512608260>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-81846/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_