CVE-2026-76519 — A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email…¶

Key facts

CVE-2026-76519 is a Critical (9.8) vulnerability: A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2026-10-14), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2026-76519 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2026-10-14), confirming exploitation in the wild. Federal remediation deadline: 2026-10-17. Prioritise patching and deploy the detection and prevention rules below.


CVE	CVE-2026-76519
Severity	Critical (9.8)
CISA KEV	Actively exploited (added 2026-10-14)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-76519/

Details¶

English | 한국어

Description¶

A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

This vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-76519
CVSS Score	9.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-76519/poc.py

Usage¶

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab¶

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start¶

# Clone and navigate to CVE directory
cd CVE-2026-76519

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints¶

Application	URL	Status
Vulnerable App	http://localhost:8080	Shows vulnerability
Patched App	http://localhost:8081	Demonstrates fix

Directory Structure¶

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References¶

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519

Generated by PoC Generator on 2026-10-15T15:51:40.871696159

Frequently asked questions¶

What is CVE-2026-76519?¶

CVE-2026-76519 is a Critical (9.8) vulnerability: A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2026-10-14), confirming active exploitation in the wild.

How do I detect CVE-2026-76519?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-76519?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2026-76519 actively exploited?¶

Yes. CVE-2026-76519 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2026-10-14, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2026-10-17. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.