CVE-2026-76443 (GCVE-0-2026-76443)
Vulnerability from cvelistv5 – Published: 2026-09-14 16:08 – Updated: 2026-09-14 16:08
VLAI
EPSS
VEX
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)
CWE
- CWE-707 - Improper Neutralization
Assigner
References
1 reference
Impacted products
2 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 | |
| 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 |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Cisco Secure Email",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "14.0.0-698"
},
{
"status": "affected",
"version": "13.5.1-277"
},
{
"status": "affected",
"version": "13.0.0-392"
},
{
"status": "affected",
"version": "14.2.0-620"
},
{
"status": "affected",
"version": "13.0.5-007"
},
{
"status": "affected",
"version": "13.5.4-038"
},
{
"status": "affected",
"version": "14.2.1-020"
},
{
"status": "affected",
"version": "14.3.0-032"
},
{
"status": "affected",
"version": "15.0.0-104"
},
{
"status": "affected",
"version": "15.0.1-030"
},
{
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"version": "15.5.0-048"
},
{
"status": "affected",
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{
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{
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{
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{
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{
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{
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{
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},
{
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},
{
"status": "affected",
"version": "16.0.2-112"
},
{
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}
]
},
{
"defaultStatus": "unknown",
"product": "Cisco Secure Email and Web Manager",
"vendor": "Cisco",
"versions": [
{
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"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"
}
]
}
],
"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."
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-707",
"description": "Improper Neutralization",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-14T16:08:59.278Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-hardening-esa-dfCrfXkm",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm"
}
],
"source": {
"advisory": "cisco-sa-hardening-esa-dfCrfXkm",
"defects": [
"CSCwu56232"
],
"discovery": "INTERNAL"
},
"title": "Cisco Secure Email Gateway Security Hardening Release"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-76443",
"datePublished": "2026-09-14T16:08:59.278Z",
"dateReserved": "2026-08-19T12:02:03.635Z",
"dateUpdated": "2026-09-14T16:08:59.278Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-76443\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2026-09-14T17:17:50.970\",\"lastModified\":\"2026-09-14T17:17:50.970\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"psirt@cisco.com\",\"affectedData\":[{\"vendor\":\"Cisco\",\"product\":\"Cisco Secure Email\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"14.0.0-698\",\"status\":\"affected\"},{\"version\":\"13.5.1-277\",\"status\":\"affected\"},{\"version\":\"13.0.0-392\",\"status\":\"affected\"},{\"version\":\"14.2.0-620\",\"status\":\"affected\"},{\"version\":\"13.0.5-007\",\"status\":\"affected\"},{\"version\":\"13.5.4-038\",\"status\":\"affected\"},{\"version\":\"14.2.1-020\",\"status\":\"affected\"},{\"version\":\"14.3.0-032\",\"status\":\"affected\"},{\"version\":\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Cisco\",\"product\":\"Cisco Secure Email and Web Manager\",\"defaultStatus\":\"unknown\",\"versions\":[{\"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\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-707\"}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm\",\"source\":\"psirt@cisco.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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