{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-29140", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "state": "PUBLISHED", "assignerShortName": "NCSC.ch", "dateReserved": "2026-03-04T09:08:07.342Z", "datePublished": "2026-04-02T08:27:52.154Z", "dateUpdated": "2026-04-02T08:27:52.154Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-04-02T08:27:52.154Z"}, "title": "S/MIME Signature Additional Certificate", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-295", "description": "CWE-295 Improper Certificate Validation", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-216", "descriptions": [{"lang": "en", "value": "CAPEC-216 Communication Channel Manipulation"}]}], "affected": [{"vendor": "SEPPmail", "product": "Secure Email Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "15.0.3", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "15.0.3"}]}]}], "descriptions": [{"lang": "en", "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to cause attacker-controlled certificates to be used for future encryption to a victim by adding the certificates to S/MIME signatures.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to cause attacker-controlled certificates to be used for future encryption to a victim by adding the certificates to S/MIME signatures."}]}], "references": [{"url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N"}}], "timeline": [{"time": "2025-10-31T14:22:00.000Z", "lang": "en", "value": "Vulnerability disclosed to SEPPmail"}, {"time": "2026-03-03T00:00:00.000Z", "lang": "en", "value": "Version 15.0.3 released"}], "credits": [{"lang": "en", "value": "Andris Suter-D\u00f6rig", "type": "finder"}, {"lang": "en", "value": "Matteo Scarlata", "type": "coordinator"}, {"lang": "en", "value": "Kenny Paterson", "type": "coordinator"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 0.5.0"}}}}

{}

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{}