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CVE-2026-76443

Cisco Secure Email Gateway Security Hardening Release

  • Critical 9.8

Description

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.

Key facts

Published
14 Sep 2026
Last changed
15 Sep 2026
Assigned by
cisco
EPSS
2.354% likely to be exploited in the next 30 days, higher than 83.999% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: none; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Secure Email
  • Default status: unknown
  • 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 (affected)
CiscoCisco Secure Email and Web Manager
  • Default status: unknown
  • 13.6.2-023 (affected)
  • 13.6.2-078 (affected)
  • 13.0.0-249 (affected)
  • 13.0.0-277 (affected)
  • 13.8.1-052 (affected)
  • 13.8.1-068 (affected)
  • 13.8.1-074 (affected)
  • 14.0.0-404 (affected)
  • 12.8.1-002 (affected)
  • 14.1.0-227 (affected)
  • 13.6.1-201 (affected)
  • 14.2.0-203 (affected)
  • 14.2.0-212 (affected)
  • 12.8.1-021 (affected)
  • 13.8.1-108 (affected)
  • 14.2.0-224 (affected)
  • 14.3.0-120 (affected)
  • 15.0.0-334 (affected)
  • 15.5.1-024 (affected)
  • 15.5.1-029 (affected)
  • 15.5.2-005 (affected)
  • 16.0.0-195 (affected)
  • 15.5.3-017 (affected)
  • 16.0.1-010 (affected)
  • 15.0.1-035 (affected)
  • 16.0.2-088 (affected)
  • 15.5.4-007 (affected)
  • 15.0.2-007 (affected)
  • 16.0.4-010 (affected)
  • 16.0.3-016 (affected)

Timeline

  1. 14 Sep 2026 Published

Weakness

Related coverage

References