---
cve: "CVE-2026-18749"
severity: "CRITICAL"
cvss: 9.8
epss: "0.5%"
vendor: "CERT/CC"
kev: false
exploited: false
published: "2026-08-12 22:17:14"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-23T19:26:32+02:00"
---

# CVE-2026-18749

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

The type=track branch authorises on _is_my_case(t_attach.case) only and never checks VinceTrackAttachment.shared. A coordinator-uploaded case artefact that has NOT been marked shared is still retrievable by any case member who has (or is sent) its uuid — leaks not-yet-released coordinator material to vendors on the case.

## CNA-Record (Kanon, cvelistV5)

- CNA: **certcc**
- State: PUBLISHED
- Stand: 2026-08-13 15:46:38

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## 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.

## Patch verfügbar (OSV)

- 478999151702c4fb9e376182f077d69216305697 (Commit)

## Referenzen

- <https://github.com/CERTCC/VINCE>
- <https://github.com/CERTCC/VINCE/pull/235>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-18749/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_