---
cve: "CVE-2026-74997"
severity: "HIGH"
cvss: 8.8
epss: "77%"
vendor: "Roundcube"
kev: false
exploited: false
published: "2026-08-17 13:16:54"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T07:00:12+02:00"
---

# CVE-2026-74997

> 8.8 HIGH · 🧪 PoC

## Beschreibung

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.

## CVSS-Vektor

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

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

## 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/b8f90e28a46d42e79a69568cba897f8f4223d9cd>
- <https://github.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c53712426c2a>
- <https://github.com/roundcube/roundcubemail/releases/tag/1.7.3>
- <https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7c>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-74997) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_