CVE-2026-29140
S/MIME Signature Additional Certificate
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.7EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
02 Apr 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
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
Affected products
SEPPmail · Secure Email GatewayWant to know if your infrastructure is exposed to this?
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