CVE-2026-76519 Cisco Secure Email Gateway Relative Path Traversal
Unauthenticated remote attackers can write arbitrary files and execute commands with root privileges via crafted email attachments when the file reputation service is enabled.
- Exploited in the wild
- Since 14 Oct 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76519?
CVE-2026-76519 is a critical path traversal vulnerability in Cisco Asyncos, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-23
Which versions are affected by CVE-2026-76519?
It affects 1 product.
Products include Cisco Asyncos.
How do I fix CVE-2026-76519?
No fix has been published for CVE-2026-76519 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Oct 2026.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-76519 being exploited?
Yes. Attackers have exploited CVE-2026-76519 in the wild since at least 14 Oct 2026.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Cisco Asyncos
- CVE-2025-20393 Cisco Multiple Products Improper Input Validation
- CVE-2026-76461 Cisco Secure Email Gateway SQL Injection
- CVE-2024-20435 Command injection in Cisco Secure Web Appliance
- CVE-2019-15956 Cisco Web Security Appliance Unauthorized Device Reset Vulnerability
- CVE-2021-34698 Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability
Sources
Also known as GHSA-6rc3-jwq8-jm3v.