CVE-2026-29136 PUBLISHED

CA Notification HTML Injection

Assigner: NCSC.ch
Reserved: 04.03.2026 Published: 02.04.2026 Updated: 02.04.2026

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to inject HTML into notification emails about new CA certificates.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Vendor	SEPPmail
Product	Secure Email Gateway
Versions	Default: unaffected affected from 0 to 15.0.3 (excl.)

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-Site Scripting') CWE