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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.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
CVE-2026-27443

S/MIME Decryption Tag Sanitization Bypass

SEPPmail Secure Email Gateway before version 15.0.1 does not properly sanitize the headers from S/MIME protected MIME entities, allowing an attacker to control trusted headers.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
CVE-2026-2747

PGP Mixed Plaintext and Encrypted Content

SEPPmail Secure Email Gateway before version 15.0.1 decrypts inline PGP messages without isolating them from surrounding unencrypted content, allowing exposure of sensitive information to an unauthorized actor.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
CVE-2026-27442

zip_attachments Path Traversal

The GINA web interface in SEPPmail Secure Email Gateway before version 15.0.1 does not properly check attachment filenames in GINA-encrypted emails, allowing an attacker to access files on the gateway.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Vendors
CVE-2026-2748

S/MIME Certificate Subject Whitespace

SEPPmail Secure Email Gateway before version 15.0.1 improperly validates S/MIME certificates issued for email addresses containing whitespaces, allowing signature spoofing.

CVSS 4.0 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
CVE-2022-41871

SEPPmail through 12.1.17 allows command injection within the Admin Portal. An authenticated attacker is able to execute arbitrary code in the context of the user root.

CVSS 3.1 · 6 Medium EPSS 1.1% KEV · Not listed
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Products
CVE-2021-31739

The SEPPmail solution is vulnerable to a Cross-Site Scripting vulnerability (XSS), because user input is not correctly encoded in HTML attributes when returned by the server.SEPPmail 11.1.10 allows XSS via a recipient address.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2021-31740

SEPPMail's web frontend, user input is not embedded correctly in the web page and therefore leads to cross-site scripting vulnerabilities (XSS).

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
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Products