# CVE-2026-76443 — Cisco Secure Email

> As of 2026-11-06, CVE-2026-76443 is a CRITICAL-severity vulnerability in Cisco Secure Email, CVSS v3.1 9.8, EPSS 2.3% (83.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-76443, most recently “Metasploit 6.5.9 Wrapup: Public Exploit Modules for Citrix NetScaler (CVE-2026-88771), Cisco Secure Email Gateway (CVE-2026-76461/76443), GitLab CI/CD Regex RCE (CVE-2026-97229), OpenBullet2, Flowise, SPIP and WordPress Bug Library”.

**Last updated:** 2026-09-15

## What is CVE-2026-76443?

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76443 are related to issues with improper neutralization that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.

The record classifies CVE-2026-76443 under weakness class [CWE-707](https://intel.threadlinqs.com/cwe/CWE-707). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 53 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 2.3% probability of exploitation in the next 30 days, higher than 83.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-14, last modified 2026-09-15

## Is CVE-2026-76443 being exploited?

It currently carries a trending score of 5 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Cisco](https://intel.threadlinqs.com/vendors/cisco): Secure Email, Secure Email and Web Manager

## How to fix CVE-2026-76443

No vendor patch reference has been recorded for CVE-2026-76443 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-76443

1 tracked threat in the Threadlinqs corpus references CVE-2026-76443, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Metasploit 6.5.9 Wrapup: Public Exploit Modules for Citrix NetScaler (CVE-2026-88771), Cisco Secure Email Gateway (CVE-2026-76461/76443), GitLab CI/CD Regex RCE (CVE-2026-97229), OpenBullet2, Flowise, SPIP and WordPress Bug Library](https://intel.threadlinqs.com/threat/TL-2026-5423) — CRITICAL · 2026-11-06

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-11-06. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [sec.cloudapps.cisco.com](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-76443
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