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CVE-2026-76443 (GCVE-0-2026-76443)

Vulnerability from cvelistv5 – Published: 2026-09-14 16:08 – Updated: 2026-09-15 17:03
VLAI
Title
Cisco Secure Email Gateway Security Hardening Release
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 00:00 UTC
CWE
  • CWE-707 - Improper Neutralization
Assigner
References
Impacted products
Vendor Product Version CPE status
Cisco Cisco Secure Email Affected: 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
guessed Create a notification for this product.
Cisco Cisco Secure Email and Web Manager Affected: 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
guessed Create a notification for this product.
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\"15.0.0-104\"}, {\"status\": \"affected\", \"version\": \"15.0.1-030\"}, {\"status\": \"affected\", \"version\": \"15.5.0-048\"}, {\"status\": \"affected\", \"version\": \"15.5.1-055\"}, {\"status\": \"affected\", \"version\": \"15.5.2-018\"}, {\"status\": \"affected\", \"version\": \"16.0.0-050\"}, {\"status\": \"affected\", \"version\": \"15.0.3-002\"}, {\"status\": \"affected\", \"version\": \"16.0.0-054\"}, {\"status\": \"affected\", \"version\": \"15.5.3-022\"}, {\"status\": \"affected\", \"version\": \"16.0.1-017\"}, {\"status\": \"affected\", \"version\": \"15.5.4-012\"}, {\"status\": \"affected\", \"version\": \"16.0.4-016\"}, {\"status\": \"affected\", \"version\": \"15.0.5-016\"}, {\"status\": \"affected\", \"version\": \"16.0.2-112\"}, {\"status\": \"affected\", \"version\": \"16.0.3-044\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Email and Web Manager\", \"versions\": [{\"status\": \"affected\", \"version\": \"13.6.2-023\"}, {\"status\": \"affected\", \"version\": \"13.6.2-078\"}, {\"status\": \"affected\", \"version\": \"13.0.0-249\"}, {\"status\": \"affected\", \"version\": \"13.0.0-277\"}, {\"status\": \"affected\", \"version\": \"13.8.1-052\"}, {\"status\": \"affected\", \"version\": \"13.8.1-068\"}, {\"status\": \"affected\", \"version\": \"13.8.1-074\"}, {\"status\": \"affected\", \"version\": \"14.0.0-404\"}, {\"status\": \"affected\", \"version\": \"12.8.1-002\"}, {\"status\": \"affected\", \"version\": \"14.1.0-227\"}, {\"status\": \"affected\", \"version\": \"13.6.1-201\"}, {\"status\": \"affected\", \"version\": \"14.2.0-203\"}, {\"status\": \"affected\", \"version\": \"14.2.0-212\"}, {\"status\": \"affected\", \"version\": \"12.8.1-021\"}, {\"status\": \"affected\", \"version\": \"13.8.1-108\"}, {\"status\": \"affected\", \"version\": \"14.2.0-224\"}, {\"status\": \"affected\", \"version\": \"14.3.0-120\"}, {\"status\": \"affected\", \"version\": \"15.0.0-334\"}, {\"status\": \"affected\", \"version\": \"15.5.1-024\"}, {\"status\": \"affected\", \"version\": \"15.5.1-029\"}, {\"status\": \"affected\", \"version\": \"15.5.2-005\"}, {\"status\": \"affected\", \"version\": \"16.0.0-195\"}, {\"status\": \"affected\", \"version\": \"15.5.3-017\"}, {\"status\": \"affected\", \"version\": \"16.0.1-010\"}, {\"status\": \"affected\", \"version\": \"15.0.1-035\"}, {\"status\": \"affected\", \"version\": \"16.0.2-088\"}, {\"status\": \"affected\", \"version\": \"15.5.4-007\"}, {\"status\": \"affected\", \"version\": \"15.0.2-007\"}, {\"status\": \"affected\", \"version\": \"16.0.4-010\"}, {\"status\": \"affected\", \"version\": \"16.0.3-016\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Except as otherwise noted previously, the Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm\", \"name\": \"cisco-sa-hardening-esa-dfCrfXkm\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"As part of Cisco\u0027s 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.\\r\\n\\r\\nThe 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-707\", \"description\": \"Improper Neutralization\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-09-14T16:08:59.278Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-76443\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T17:03:58.065Z\", \"dateReserved\": \"2026-08-19T12:02:03.635Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-09-14T16:08:59.278Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.