CVE-2026-2743

SEPPmail User Web Interface Arbitrary File Write to RCE

CVSS 10 CRITICALEPSS 0.8%CWE-22 CWE-434

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 10EPSS 0.8%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

05 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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/