CVE-2026-2743 PUBLISHED

SEPPmail User Web Interface Arbitrary File Write to RCE

Assigner: NCSC.ch
Reserved: 19.02.2026 Published: 05.03.2026 Updated: 05.03.2026

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

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 10

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	SeppMail
Product	SeppMail
Versions	Default: unknown affected from unknown to 15.0.2.1 (incl.)

Credits

Manuel Feifel and Dario Weiss of InfoGuard Labs finder

References

Problem Types

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE
CWE-434 Unrestricted Upload of File with Dangerous Type CWE

Impacts

CAPEC-242 Code Injection