---
cve: "CVE-2026-93647"
severity: "CRITICAL"
cvss: 9.3
epss: "0.2%"
vendor: "Zimbra"
kev: false
exploited: false
published: "2026-09-25 14:17:23"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-27T17:06:16+02:00"
---

# CVE-2026-93647

> 9.3 CRITICAL

## Beschreibung

An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.

## CNA-Record (Kanon, cvelistV5)

- CNA: **rapid7**
- State: PUBLISHED
- Stand: 2026-09-26 03:55:48
- CNA-CVSS: **9.3** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## Referenzen

- <https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-93647) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_