CVE-2026-2743
SEPPmail User Web Interface Arbitrary File Write to RCE
Description
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
INFO
Published Date :
March 5, 2026, 7:16 a.m.
Last Modified :
May 19, 2026, 8:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 455daabc-a392-441d-aa46-37d35189897c | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update SeppMail to version 15.0.2.2 or later.
- Apply vendor patches for affected versions.
- Restrict file upload permissions.
- Monitor file system for unauthorized writes.
Public PoC/Exploit Available at Github
CVE-2026-2743 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2743.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2743 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2743
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Cybersecurity Vulnerability Report: May 2026
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2743 vulnerability anywhere in the article.
-
CybersecurityNews
Critical SEPPmail Gateway Flaws Allow Remote Code Execution and Mail Traffic Theft
Critical vulnerabilities in the SEPPmail Secure Email Gateway have exposed organizations to remote code execution (RCE) and potential interception of sensitive email traffic. Researchers uncovered sev ... Read more
-
The Hacker News
SEPPMail Secure E-Mail Gateway Vulnerabilities Enable RCE and Mail Traffic Access
Critical security vulnerabilities have been disclosed in SEPPMail Secure E-Mail Gateway, an enterprise-grade email security solution, that could be exploited to achieve remote code execution and enabl ... Read more
The following table lists the changes that have been made to the
CVE-2026-2743 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 19, 2026
Action Type Old Value New Value Added Reference https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/ -
CVE Modified by [email protected]
May. 18, 2026
Action Type Old Value New Value Changed Description 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 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 Added Reference https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/ Removed Reference https://labs.infoguard.ch/advisories/seppmail Removed Reference Type https://labs.infoguard.ch/advisories/seppmail Types: Third Party Advisory -
Initial Analysis by [email protected]
Mar. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-22 Added CPE Configuration OR *cpe:2.3:a:seppmail:seppmail:*:*:*:*:*:*:*:* versions up to (including) 15.0.2.1 Added Reference Type Switzerland Government Common Vulnerability Program: https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html Types: Release Notes Added Reference Type Switzerland Government Common Vulnerability Program: https://labs.infoguard.ch/advisories/seppmail Types: Third Party Advisory -
New CVE Received by [email protected]
Mar. 05, 2026
Action Type Old Value New Value Added Description 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 Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:X Added CWE CWE-22 Added CWE CWE-434 Added Reference https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html Added Reference https://labs.infoguard.ch/advisories/seppmail