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    CVE-2026-29144

    SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge security tags using Unicode lookalike characters.

    Published:Apr 2, 2026
    Last Modified:Apr 16, 2026
    EPS:Apr 2, 2026
    EPSS Score:0.001
    CVSS Score:5.3

    Affected Products

    Vendor
    Seppmail
    Product
    Secure Email Gateway
    Vendor
    Seppmail
    Product
    Seppmail Secure Email Gateway

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-20 Improper Input Validation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-84830 (CVSS 8.6) — SEPPmail Secure Email Gateway before 15.0.7 contains a command injection vulnerability that allows authenticat…
    CVE-2026-8811 (CVSS 7.1) — SEPPmail versions before 15.0.5 allow improper handling of attachment filenames during encrypted PDF generatio…
    CVE-2026-44126 (CVSS 9.2) — SEPPmail Secure Email Gateway before version 15.0.4 insecurely deserializes untrusted data, which can be reach…
    CVE-2026-44125 (CVSS 9.3) — SEPPmail Secure Email Gateway before version 15.0.4 fails to enforce authorization checks for multiple endpoin…
    CVE-2026-44129 (CVSS 8.3) — SEPPmail Secure Email Gateway before version 15.0.4 contains a server-side template injection vulnerability in…
    CVE-2026-44128 (CVSS 9.3) — SEPPmail Secure Email Gateway before version 15.0.2.1 allows unauthenticated remote code execution in the new …
    CVE-2026-44127 (CVSS 8.8) — SEPPmail Secure Email Gateway before version 15.0.4 contains an unauthenticated path traversal vulnerability i…
    CVE-2026-7864 (CVSS 6.9) — SEPPmail Secure Email Gateway before version 15.0.4 exposes server environment variables through an unauthenti…
    CVE-2026-29136 (CVSS 5.3) — SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to inject HTML into notification emails…
    CVE-2026-29139 (CVSS 7.8) — SEPPmail Secure Email Gateway before version 15.0.3 allows account takeover by abusing GINA account initializa…

    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