cisco-sa-hardening-esa-dfCrfXkmCriticalCVSS 9.8

Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026

Published
September 14, 2026
Last Modified
October 14, 2026

🔗 CVE IDs covered (5)

CVE-2026-20353 →CVE-2026-76440 →CVE-2026-76441 →CVE-2026-76442 →CVE-2026-76443 →

📋 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.

These vulnerabilities were found during internal testing. Two of them are known to be actively exploited. For more information, see Cisco Secure Email Gateway SQL Injection Vulnerability ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX"] and Cisco Secure Email Gateway Arbitrary File Write Vulnerability ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp"]. To assist customers in patching and streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class — Common Weakness Enumeration (CWE) — and assigned a single Common Vulnerabilities and Exposures identifier (CVE ID) to each CWE grouping.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

CVE-2026-76440 — Cisco Secure Email Gateway Security Hardening Release (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVE-2026-20353 — Cisco Secure Email Gateway Security Hardening Release (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVE-2026-76441 — Cisco Secure Email Gateway Security Hardening Release (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVE-2026-76442 — Cisco Secure Email Gateway Security Hardening Release (CVSS 3.1 7.5, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVE-2026-76443 — Cisco Secure Email Gateway Security Hardening Release (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

🎯 Affected products349

  • Cisco Secure Email
  • Cisco Secure Email and Web Manager
  • Cisco Secure Email 10.0.0-082
  • Cisco Secure Email 10.0.0-124
  • Cisco Secure Email 10.0.0-125
  • Cisco Secure Email 10.0.0-203
  • Cisco Secure Email 10.0.1
  • Cisco Secure Email 10.0.1-087
  • Cisco Secure Email 10.0.1-103
  • Cisco Secure Email 11.0.0
  • Cisco Secure Email 11.0.0-074
  • Cisco Secure Email 11.0.0-105
  • Cisco Secure Email 11.0.0-255
  • Cisco Secure Email 11.0.0-260
  • Cisco Secure Email 11.0.0-264
  • Cisco Secure Email 11.0.0-266
  • Cisco Secure Email 11.0.0-267
  • Cisco Secure Email 11.0.0-272
  • Cisco Secure Email 11.0.0-274
  • Cisco Secure Email 11.0.1-027
  • Cisco Secure Email 11.0.1-030
  • Cisco Secure Email 11.0.1-301
  • Cisco Secure Email 11.0.1-401
  • Cisco Secure Email 11.0.1-505
  • Cisco Secure Email 11.0.2-037
  • Cisco Secure Email 11.0.2-038
  • Cisco Secure Email 11.0.2-044
  • Cisco Secure Email 11.0.3
  • Cisco Secure Email 11.0.3-238
  • Cisco Secure Email 11.1.0
  • +319 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address these vulnerabilities.

🔗 References (4)