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CVE-2026-114426

Pre-authentication upload parsing permits resource exhaustion

SEPPmail Secure Email Gateway before 15.1.1 processes and writes v1 file-interface upload data before authenticating the caller and without an absolute request-size limit. An unauthenticated remote attacker can occupy workers and consume temporary storage with concurrent or slow requests, causing service unavailability.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-114425

Forged LFT metadata permits arbitrary file read and deletion

SEPPmail Secure Email Gateway before 15.1.1 trusts a file path supplied in externally provided Large File Transfer attachment metadata. An unauthenticated remote sender can cause the mail-processing worker to disclose, move, or delete an accessible regular file when LFT is enabled and the message reaches an affected secure-mail processing path. The validated workers ran as root.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-114421

Empty initial password permits GINA account takeover

SEPPmail Secure Email Gateway before 15.1.1 permits password recovery for a created but unregistered GINA account whose initial password is empty without adequately verifying ownership. A remote unauthenticated attacker who identifies such an account can set a new password, authenticate as that account, and prevent the intended recipient from using it until recovery.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-114420

LDAP wildcard injection exposes GINA recipient accounts

SEPPmail Secure Email Gateway before 15.1.1 does not neutralize LDAP metacharacters in an unauthenticated account-selection input in its GINA web interface. A remote unauthenticated attacker can enumerate email addresses.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-84832

Unsafe deserialization in the REST interface

SEPPmail Secure Email Gateway before 15.0.6 deserializes attacker-controlled data in a privileged REST import workflow without adequate validation. An attacker with a privileged API token can execute arbitrary commands with "nobody" privileges.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-84831

Mandatory MFA bypass before enrollment

SEPPmail Secure Email Gateway before 15.0.7 creates a fully privileged session before required multi-factor authentication enrollment is completed. An attacker with the password for an MFA-required but unenrolled account can access protected functionality without providing a second factor.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-9592

Sensitive Information Disclosure in HTTP header

SEPPmail Secure Email Gateway & SEPPmail Cloud before version 15.0.4.2 allows an attacker to replay & hijack a user session in the GINA web portal, as the session token is disclosed inside the URL and a HTTP header.

CVSS 4.0 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Secure Email Gateway
CVE-2026-2746

Missing PGP Signature Tag

SEPPmail Secure Email Gateway before version 15.0.1 does not properly communicate PGP signature verification results, leaving users unable to detect forged emails.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Seppmail Secure Email Gateway
CVE-2026-27444

Header Email Address Parsing

SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.

CVSS 4.0 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Seppmail Secure Email Gateway
CVE-2026-27445

PGP Signature Reflection

SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generated by the expected key, allowing signature spoofing.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Seppmail
Products
Seppmail Seppmail Secure Email Gateway