CVEs / CVE-2026-76519
CVE-2026-76519: Cisco Secure Email Gateway Relative Path Traversal Vulnerability
- Known exploited in the CISA KEV catalog since 14 Oct 2026
- critical 9.8 CVSS 3.1 (from the CNA)
- EPSS 2.15% chance of exploitation in the next 30 days, higher than 82% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Cisco Cisco Secure Email | 14.0.0-698 | — |
| Cisco Cisco Secure Email | 13.5.1-277 | — |
| Cisco Cisco Secure Email | 13.0.0-392 | — |
| Cisco Cisco Secure Email | 14.2.0-620 | — |
| Cisco Cisco Secure Email | 13.0.5-007 | — |
| Cisco Cisco Secure Email | 13.5.4-038 | — |
| Cisco Cisco Secure Email | 14.2.1-020 | — |
| Cisco Cisco Secure Email | 14.3.0-032 | — |
| Cisco Cisco Secure Email | 15.0.0-104 | — |
| Cisco Cisco Secure Email | 15.0.1-030 | — |
| Cisco Cisco Secure Email | 15.5.0-048 | — |
| Cisco Cisco Secure Email | 15.5.1-055 | — |
| Cisco Cisco Secure Email | 15.5.2-018 | — |
| Cisco Cisco Secure Email | 16.0.0-050 | — |
| Cisco Cisco Secure Email | 15.0.3-002 | — |
| Cisco Cisco Secure Email | 16.0.0-054 | — |
| Cisco Cisco Secure Email | 15.5.3-022 | — |
| Cisco Cisco Secure Email | 16.0.1-017 | — |
| Cisco Cisco Secure Email | 15.5.4-012 | — |
| Cisco Cisco Secure Email | 16.0.4-016 | — |
| Cisco Cisco Secure Email | 15.0.5-016 | — |
| Cisco Cisco Secure Email | 16.0.2-112 | — |
| Cisco Cisco Secure Email | 16.0.3-044 | — |
Exploitation
| In CISA KEV since | 14 Oct 2026 |
|---|---|
| Due date for US federal agencies | 17 Oct 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-23 |
References
- CVE-2026-76519 on NVD
- CVE-2026-76519 in the CISA KEV catalog
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.