Secure Email Gateway CVEs and Security Vulnerabilities

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CVE-2026-29141

Bounded Subject Tag Sanitization

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge tags such as [signed OK].

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed

Vendors

Seppmail

Products

Secure Email Gateway Seppmail Secure Email Gateway

CVE-2026-29143

S/MIME Decryption Impersonation

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.

CVSS 4.0 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Seppmail

Products

Secure Email Gateway Seppmail Secure Email Gateway

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