HIGHCVE-2026-29140Published Modified CNA NCSC.ch
CVE-2026-29140: S/MIME Signature Additional Certificate
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.
Metrics
- CVSS v4.0
- 7.7
- Severity
- HIGH
- Fixed in
- 15.0.3
- Affected Products
- 1
Fix available
15.0.3
Affected packages
- SEPPmail / Secure Email Gateway< 15.0.3 (from 0)
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:NReferences