CVE-2026-29140 — S/MIME Signature Additional Certificate

CVE-2026-29140

S/MIME Signature Additional Certificate PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
SEPPmail / Secure Email Gateway	affected 0 before 15.0.3

CWE

CWE-295

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.