Actively exploited in the wild
Cisco Secure Email Gateway Relative Path Traversal Vulnerability
Cisco - Secure Email Gateway · Listed in the CISA KEV since 2026-10-14. This indicates confirmed attacks in production environments.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVE-2026-76519
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
High risk77th percentile - higher than 77% of all known CVEs
Summary
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. It is due to improper handling of email attachments when the file reputation service is enabled; an attacker could send an email with a crafted attachment through an affected device, potentially allowing arbitrary file writes and command execution with root privileges.
Risk Assessment
The vulnerability may allow an unauthenticated remote attacker to write arbitrary files and execute commands with root privileges on the device's operating system. This poses a critical risk of full compromise of the email gateway.
Recommendation
Apply the patches provided by Cisco for Cisco Secure Email Gateway. Until patched, consider disabling the file reputation service or limiting email attachment processing where possible.
Other vulnerabilities in Cisco Secure Email Gateway
Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS