---
cve: "CVE-2026-76443"
severity: "CRITICAL"
cvss: 9.8
epss: "0.4%"
vendor: "Cisco"
kev: false
exploited: false
published: "2026-09-14 16:08:59"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T23:14:27+02:00"
---

# CVE-2026-76443

> 9.8 CRITICAL

## Beschreibung

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-76443 are related to issues with improper neutralization that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.

## 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-707** — Improper Neutralization
  The product does not ensure or incorrectly ensures that structured messages or data are well-formed and that certain security properties are met before being read from an upstream component or sent to a downstream component.

## Angriffsmuster (CAPEC)

- [CAPEC-3 — Using Leading 'Ghost' Character Sequences to Bypass Input Filters](https://capec.mitre.org/data/definitions/3.html) _(Severity: Medium)_
- [CAPEC-43 — Exploiting Multiple Input Interpretation Layers](https://capec.mitre.org/data/definitions/43.html) _(Severity: High)_
- [CAPEC-250 — XML Injection](https://capec.mitre.org/data/definitions/250.html)
- [CAPEC-276 — Inter-component Protocol Manipulation](https://capec.mitre.org/data/definitions/276.html)
- [CAPEC-277 — Data Interchange Protocol Manipulation](https://capec.mitre.org/data/definitions/277.html)
- [CAPEC-278 — Web Services Protocol Manipulation](https://capec.mitre.org/data/definitions/278.html)
- [CAPEC-279 — SOAP Manipulation](https://capec.mitre.org/data/definitions/279.html) _(Severity: High)_
- [CAPEC-468 — Generic Cross-Browser Cross-Domain Theft](https://capec.mitre.org/data/definitions/468.html) _(Severity: Medium)_

## Referenzen

- <https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76443) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_