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vuln-cve/data/2026/2xxx/CVE-2026-2748.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-2748",
"assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c",
"state": "PUBLISHED",
"assignerShortName": "NCSC.ch",
"dateReserved": "2026-02-19T13:56:33.534Z",
"datePublished": "2026-03-04T08:48:58.786Z",
"dateUpdated": "2026-03-04T16:55:03.279Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Secure Email Gateway",
"vendor": "SEPPmail",
"versions": [
{
"lessThan": "15.0.1",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*",
"versionEndExcluding": "15.0.1",
"versionStartIncluding": "0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Andris Suter-Dörig"
},
{
"lang": "en",
"type": "coordinator",
"value": "Matteo Scarlata"
},
{
"lang": "en",
"type": "coordinator",
"value": "Kenny Paterson"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "SEPPmail Secure Email Gateway before version 15.0.1 improperly validates S/MIME certificates issued for email addresses containing whitespaces, allowing signature spoofing."
}
],
"value": "SEPPmail Secure Email Gateway before version 15.0.1 improperly validates S/MIME certificates issued for email addresses containing whitespaces, allowing signature spoofing."
}
],
"impacts": [
{
"capecId": "CAPEC-473",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-473 Signature Spoof"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-295",
"description": "CWE-295 Improper Certificate Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "455daabc-a392-441d-aa46-37d35189897c",
"shortName": "NCSC.ch",
"dateUpdated": "2026-03-04T08:48:58.786Z"
},
"references": [
{
"tags": [
"release-notes"
],
"url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure"
}
],
"source": {
"discovery": "EXTERNAL"
},
"timeline": [
{
"lang": "en",
"time": "2025-10-31T14:22:00.000Z",
"value": "Vulnerability disclosed to SEPPmail"
},
{
"lang": "en",
"time": "2026-01-06T00:00:00.000Z",
"value": "SEPPmail version 15.0.1 released"
}
],
"title": "S/MIME Certificate Subject Whitespace",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-03-04T16:51:21.240988Z",
"id": "CVE-2026-2748",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-03-04T16:55:03.279Z"
}
}
]
}
}