Vulnerability Intelligence Report
SEPPmail User Web Interface Arbitrary File Write to RCE
CVE-2026-2743
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
No Active Exploit Signals
CVSS Base Score
10.0
CRITICAL
EPSS Probability:0.84%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| SeppMail | SeppMail | unknown <= 15.0.2.1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.842%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Switzerland National Cyber Security Centre (NCSC) · CERT · Switzerland |
| Reserved | 2026-02-19T12:28:37 |
| Published | 2026-03-05T06:45:21 |
| Last Updated | 2026-05-19T19:44:01 |
Community Chatter & Buzz