---
cve: "CVE-2026-75006"
severity: "MEDIUM"
cvss: 5.8
epss: "34%"
vendor: "Roundcube"
kev: false
exploited: false
published: "2026-08-17 13:16:55"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T06:43:34+02:00"
---

# CVE-2026-75006

> 5.8 MEDIUM · 🧪 PoC

## Beschreibung

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. This issue exists because of insufficient fixes for CVE-2026-35540, CVE-2026-48843 and CVE-2026-62643.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 4a2bb87d9ea93578acb9bb03599abf754c33a33f (Commit)
- 8473c30fd06f1aa4cfe4304ec54f54aef3b45abe (Commit)

## Referenzen

- <https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3>
- <https://github.com/roundcube/roundcubemail/releases/tag/1.6.18>
- <https://github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21223>
- <https://github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba903455c9>
- <https://github.com/roundcube/roundcubemail/releases/tag/1.7.3>
- <https://github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bbe00>
- <https://github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d90403322d>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-75006) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_