CVE-2026-2743

SEPPmail User Web Interface Arbitrary File Write to RCE

CVSS 10 CRITICALEPSS 0.8%CWE-22 CWE-434

Arbitrary File Write via Path Traversal upload to Remote Code Execution in SeppMail User Web Interface. The affected feature is the large file transfer (LFT). This issue affects SeppMail: 15.0.2.1 and before

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y

Affected products

SeppMail · SeppMail

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References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/