Cisco Secure Email Gateway Arbitrary File Write Vulnerability
Summary
| CVE | CVE-2026-76519 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-14 17:19:10 UTC |
| Updated | 2026-10-15 13:47:19 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA KEV: Listed on 2026-10-14; due 2026-10-17; ransomware use Unknown
Problem Types: CWE-23 | CWE-23 Relative Path Traversal
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSSV3_1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known Exploited Vulnerability
| Vendor | Cisco |
|---|---|
| Product | Secure Email Gateway |
| Name | Cisco Secure Email Gateway Relative Path Traversal Vulnerability |
| 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. |
| Notes | https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-76519 |
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | Cisco Secure Email | affected 14.0.0-698 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 13.5.1-277 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 13.0.0-392 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 14.2.0-620 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 13.0.5-007 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 13.5.4-038 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 14.2.1-020 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 14.3.0-032 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.0.0-104 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.0.1-030 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.5.0-048 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.5.1-055 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.5.2-018 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 16.0.0-050 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.0.3-002 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 16.0.0-054 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.5.3-022 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 16.0.1-017 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.5.4-012 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 16.0.4-016 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 15.0.5-016 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 16.0.2-112 | Not specified |
| CNA | Cisco | Cisco Secure Email | affected 16.0.3-044 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-af... | [email protected] | sec.cloudapps.cisco.com | Vendor Advisory |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-10-14T00:00:00.000Z | CVE-2026-76519 added to CISA KEV |
Exploits
CNA: In October 2026, the Cisco PSIRT became aware of active exploitation of this vulnerability.
There are currently no legacy QID mappings associated with this CVE.