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Public proof of conceptAwaiting NVD analysis

CVE-2026-76443

A public proof of concept exists; no exploitation attested.

  • Published2026-09-14
  • WeaknessCWE-707

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-09-1417:17CVE publishedNVD

Versions per branch

Products declared by the CNA

As cisco, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Cisco Secure Emailother versions: unknown
    Affected
    • = 14.0.0-698no fix stated
    • = 13.5.1-277no fix stated
    • = 13.0.0-392no fix stated
    • = 14.2.0-620no fix stated
    • = 13.0.5-007no fix stated
    • = 13.5.4-038no fix stated
    • = 14.2.1-020no fix stated
    • = 14.3.0-032no fix stated

    15 more version lines in the CVE record.

  • Cisco Secure Email and Web Managerother versions: unknown
    Affected
    • = 13.6.2-023no fix stated
    • = 13.6.2-078no fix stated
    • = 13.0.0-249no fix stated
    • = 13.0.0-277no fix stated
    • = 13.8.1-052no fix stated
    • = 13.8.1-068no fix stated
    • = 13.8.1-074no fix stated
    • = 14.0.0-404no fix stated

    22 more version lines in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-14

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-76443 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/unix/smtp/cisco_secure_email_gateway_smime_sqli_rcerank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-09-14
Last Modified
2026-09-15
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-7r4m-5539-57x5

Frequently asked questions

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.

Is CVE-2026-76443 actively exploited?

Active exploitation of CVE-2026-76443 has not been confirmed. Its EPSS score was 2.4% on 2026-11-12, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-76443?

CVE-2026-76443 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record