CVE-2026-2743

CRITICALNVD 9.89.8—

9.8

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 v3: 9.8
EG Score: 9.8(medium)
EPSS: 36.3%
KEV: Not listed

Published

March 5, 2026

Last Modified

May 19, 2026

Advisory Details (2)

Auto-updated May 20, 2026

No patch confirmed yet.

generic

SeppMail Secure E-Mail Gateway: Critical RCE and LFI Vulnerabilities - InfoGuard Labs

https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/

generic

15.0.4.3 Hotfix Release

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html

Vendor Advisories for CVE-2026-2743(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-3hq3-ff7h-6mf5
GitHub Security AdvisoriesCritical
Arbitrary File Write via Path Traversal upload to Remote Code Execution in SeppMail User Web...

Frequently asked(5)

What is CVE-2026-2743?

CVE-2026-2743 is a critical vulnerability published on March 5, 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

When was CVE-2026-2743 disclosed?

CVE-2026-2743 was first published in the National Vulnerability Database on March 5, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-2743 actively exploited?

CVE-2026-2743 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-2743?

CVE-2026-2743 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2026-2743?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2743, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-2743

📅 Published

🔄 Last Modified

📋 Advisory Details (2)