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    CVE-2026-76440

    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-2026-76440 are related to path traversal issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-23.

    Published:Sep 14, 2026
    Last Modified:Sep 17, 2026
    EPS:Sep 14, 2026
    EPSS Score:0.00453
    CVSS Score:9.8

    Affected Products

    Vendor
    Cisco
    Product
    Secure Email
    Vendor
    Cisco
    Product
    Secure Email And Web Manager

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-23 Relative Path Traversal

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-139 Relative Path Traversal
    CAPEC-76 Manipulating Web Input to File System Calls

    Related CVEs

    CVE-2026-76519 (CVSS 9.8) — A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an …
    CVE-2026-76442 (CVSS 7.5) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gatewa…
    CVE-2026-76461 (CVSS 9.8) — A vulnerability in the email parsing of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an u…
    CVE-2026-76443 (CVSS 9.8) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gatewa…
    CVE-2026-20353 (CVSS 9.8) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gatewa…
    CVE-2026-20355 (CVSS 5.9) — Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality…
    CVE-2026-20354 (CVSS 5.9) — Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality…
    CVE-2025-20393 (CVSS 10) — A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Ci…
    CVE-2025-20180 (CVSS 4.8) — A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email and Web…
    CVE-2020-3548 (CVSS 5.3) — A vulnerability in the Transport Layer Security (TLS) protocol implementation of Cisco AsyncOS software f…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High