Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Exploitation and remediation

• Exploitation evidence

  Confirmed in CISA KEV since Oct 14, 2026. Listed in the CISA Known Exploited Vulnerabilities catalog.

• Patch and remediation

  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. CISA due date Oct 17, 2026.

• Safe detection guidance

  Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 14, 2026 · CISA KEV

   Known exploited

   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

2. Oct 14, 2026 · NIST NVD

   Detected

   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 cr

3. Oct 14, 2026 · NIST NVD

   Updated

   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 cr

4. Oct 15, 2026 · NIST NVD

   Updated

   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 cr

5. Oct 15, 2026 · NIST NVD

   Updated

   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 cr

6. Oct 17, 2026 · CISA KEV

   Remediation due

   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

Affected

• cpe cisco/asyncosversion unspecified
• vendor Cisco Cisco Secure Emailversion unspecified
• vendor Cisco Secure Email Gatewayversion unspecified

Sources

• Canadian Centre for Cyber SecurityGovernment advisoryCVE-2026-76519

  Serial number: AV26-1042 Date: October 14, 2026 As of October 14, 2026, Cisco is affected by vulnerabilities in the following products: Cisco AsyncOS Software for Cisco Secure Email Gateway Release 15.5 version prior to 15.5.5-014 16.5 versions prior to 16.5.0-780 Cisco Secure Em

  cyber.gc.ca
• CIRCL Vulnerability LookupVulnerability recordCVE-2026-76519

  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

  vulnerability.circl.lu
• CISA Cybersecurity AdvisoriesGovernment advisoryCVE-2026-76519

  CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-0322 Palo Alto Networks PAN-OS Code Injection Vulnerability CVE-2026-76519 Cisco Secure Email Gateway Relative Path

  cisa.gov
• CISA KEVConfirmed exploitationCVE-2026-76519

  Cisco Secure Email Gateway contains a relative path traversal vulnerability that could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

  cisa.gov
• Cisco Security AdvisoriesVendor advisoryCVE-2026-76519

  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

  sec.cloudapps.cisco.com
• CVE.orgVulnerability recordCVE-2026-76519

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-76519

  30-day exploitation probability 1.7%

  first.org
• NIST NVDVulnerability recordCVE-2026-76519

  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

  nvd.nist.gov

References

• CISA note · nvd.nist.gov
• Reference · sec.cloudapps.cisco.com
• Reference · cisa.gov
• CISA note · cisa.gov
• CISA note · cisa.gov