CVE-2026-76519Cisco Secure Email Gateway Arbitrary File Write Vulnerability
- 9.8CriticalCVSS base score
- 6.2%Exploitation in 30 daysEPSS · top 6.4% of all CVEs
- YesKnown exploitedin CISA's KEV since 14 Oct 2026
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Cisco Secure Email Gateway Relative Path Traversal Vulnerability.
- Added
- 14 Oct 2026
- Fix due (US federal)
- 17 Oct 2026
- Used by ransomware
- Not known
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.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 14 Oct 2026.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module for it. CISA's SSVC rates its exploitation: it is being exploited.
Show the exploits1
Metasploit modules1 module
- Cisco Secure Email Gateway AMP Arbitrary File Write RCE (Metasploit module) (opens in a new tab)
exploit/unix/smtp/cisco_secure_email_gateway_amp_file_write_rceRank gooddisclosed 14 Oct 2026
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By cisco
- 56 days later
· 56 days later
Published
Added to CISA KEV
Known exploited in the wild
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 6.2% · top 6.4% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 14.0.0-698
- affected 13.5.1-277
- affected 13.0.0-392
- affected 14.2.0-620
- affected 13.0.5-007
- affected 13.5.4-038
- affected 14.2.1-020
- affected 14.3.0-032
- affected 15.0.0-104
- affected 15.0.1-030
- affected 15.5.0-048
- affected 15.5.1-055
- affected 15.5.2-018
- affected 16.0.0-050
- affected 15.0.3-002
- affected 16.0.0-054
- affected 15.5.3-022
- affected 16.0.1-017
- affected 15.5.4-012
- affected 16.0.4-016
- affected 15.0.5-016
- affected 16.0.2-112
- affected 16.0.3-044
What to do
Exploitation: In October 2026, the Cisco PSIRT became aware of active exploitation of this vulnerability.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-101420 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-76519)Record last updated .