CVE-2026-29143
CRITICAL WAF: Medium
CVSS 9.1
Published: 2026-04-02
CWE-20
SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to control trusted headers.
WAF Coverage Analysis
Improper Input Validation
Medium WAF Coverage
OWASP: A03:2021 Injection
920xxx - Protocol Enforcement 941xxx - XSS / XXE 942xxx - SQL Injection
Affected Software
| Vendor | Product | Version |
|---|---|---|
| seppmail | secure_email_gateway | up to 15.0.3 |
References
- downloads.seppmail.com (Release Notes)