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    CVE-2026-2748

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

    Published:Mar 4, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 4, 2026
    EPSS Score:0.00024
    CVSS Score:5.3

    Affected Products

    Vendor
    Seppmail
    Product
    Seppmail
    Vendor
    Seppmail
    Product
    Seppmail Secure Email Gateway

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    CVE-2026-2743 (CVSS 10) — Arbitrary File Write via Path Traversal upload to Remote Code Execution in SeppMail User Web Interface. The af…
    CVE-2026-27441 (CVSS 9.5) — SEPPmail Secure Email Gateway before version 15.0.1 insufficiently neutralizes the PDF encryption password, al…
    CVE-2026-27442 (CVSS 9.3) — The GINA web interface in SEPPmail Secure Email Gateway before version 15.0.1 does not properly check attachme…
    CVE-2026-27445 (CVSS 6.9) — SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generate…
    CVE-2026-27444 (CVSS 7.8) — SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email header…
    CVE-2026-2747 (CVSS 6.9) — SEPPmail Secure Email Gateway before version 15.0.1 decrypts inline PGP messages without isolating them from s…
    CVE-2026-27443 (CVSS 8.2) — SEPPmail Secure Email Gateway before version 15.0.1 does not properly sanitize the headers from S/MIME protect…
    CVE-2026-2746 (CVSS 6.9) — SEPPmail Secure Email Gateway before version 15.0.1 does not properly communicate PGP signature verification r…
    CVE-2022-41871 (CVSS 6) — SEPPmail through 12.1.17 allows command injection within the Admin Portal. An authenticated attacker is able t…
    CVE-2021-31740 (CVSS 6.1) — SEPPMail's web frontend, user input is not embedded correctly in the web page and therefore leads to cross-sit…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High