---
title: "CVE-2026-76519: Cisco Secure Email Gateway - Unrestricted File Upload"
description: "Cisco Secure Email Gateway contains an unrestricted file upload vulnerability caused by improper handling of email attachments in the Advanced Malware Protection feature, letting unauthenticated remote attackers write arbitrary files and execute commands with root privileges, exploit requires sending crafted email attachments."
url: https://panop.io/threat-heartbeat/CVE-2026-76519/
---

# CVE-2026-76519 Cisco Secure Email Gateway - Unrestricted File Upload

Cisco Secure Email Gateway contains an unrestricted file upload vulnerability caused by improper handling of email attachments in the Advanced Malware Protection feature, letting unauthenticated remote attackers write arbitrary files and execute commands with root privileges, exploit requires sending crafted email attachments.

CVSS base score 9.8 /10

Critical

CISA KEV

Exploited in the wild

Public exploit

Proof of concept available

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76519)

## Details

Type

Unrestricted File Upload

Impact

Remote Code Execution, File System Write

CVSS vector

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

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-23](https://cwe.mitre.org/data/definitions/23.html)

## Vendor fix

Update to the latest version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76519](https://nvd.nist.gov/vuln/detail/CVE-2026-76519)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp](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](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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