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CVE-2026-29140: Improper Certificate Validation

🗓️ 02 Apr 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com

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.

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-29140
2 Apr 202608:27
–attackerkb
circl
Circl
CVE-2026-29140
2 Apr 202610:11
–circl
cnnvd
CNNVD
SEPPmail Secure Email Gateway 安全漏洞
2 Apr 202600:00
–cnnvd
cve
CVE
CVE-2026-29140
2 Apr 202608:27
–cve
cvelist
Cvelist
CVE-2026-29140 S/MIME Signature Additional Certificate
2 Apr 202608:27
–cvelist
euvd
EUVD
EUVD-2026-18160
2 Apr 202609:30
–euvd
nvd
NVD
CVE-2026-29140
2 Apr 202609:16
–nvd
ptsecurity
Positive Technologies
PT-2026-29697
2 Apr 202600:00
–ptsecurity
redhatcve
RedhatCVE
CVE-2026-29140
3 Apr 202610:58
–redhatcve
vulnrichment
Vulnrichment
CVE-2026-29140 S/MIME Signature Additional Certificate
2 Apr 202608:27
–vulnrichment

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16 Apr 2026 00:00Current
CVSS 3.15.3
CVSS 47.7
EPSS0.0012
SSVC
0