---
cve: "CVE-2026-74999"
severity: "MEDIUM"
cvss: 5.4
epss: "22%"
vendor: "Roundcube"
kev: false
exploited: false
published: "2026-08-17 13:16:54"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T07:27:05+02:00"
---

# CVE-2026-74999

> 5.4 MEDIUM · 🧪 PoC

## Beschreibung

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the "Add to address book" action was subject to stored XSS.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| 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/32f20c6bfd12dff9cfb6880ae303e740f0804fe8>
- <https://github.com/roundcube/roundcubemail/releases/tag/1.7.3>
- <https://github.com/roundcube/roundcubemail/commit/2d2a9604a820ee279c9ffcfe856b9b93a93995a8>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-74999) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_