Critical-Severity Flaw in Cisco Secure Email Tracked as CVE-2026-76519
A newly published critical vulnerability in Cisco Secure Email carries a CVSS score of 9.8. Here is what is affected and how to respond.
Key points
- CVE-2026-76519 affects Cisco Secure Email.
- CVSS 9.8 (Critical).
- No exploitation confirmed yet.
Cisco Secure Email is affected by CVE-2026-76519, a security flaw that the National Vulnerability Database rates 9.8 out of 10.
At a glance
- CVE
- CVE-2026-76519
- Product
- Cisco Secure Email
- CVSS
- 9.8 Critical
- Weakness
- CWE-23
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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 versions
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Secure Email | 14.0.0-698, 13.5.1-277, 13.0.0-392, 14.2.0-620 |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-76519
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-76519?
CVE-2026-76519 is a CWE-23 vulnerability in Cisco Secure Email.
How severe is CVE-2026-76519?
It has a CVSS score of 9.8 Critical.
Is CVE-2026-76519 being exploited?
There is no public confirmation of exploitation at the time of publication.
