SEPPmail User Web Interface Arbitrary File Write to RCE
Priority HIGH 82CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-434.
Summary
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
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00948 61st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-2743
- 2026-10-03 Alias added: GHSA-3hq3-ff7h-6mf5
References
More Seppmail vulnerabilities
- TI-2021-11768 SEPPMail's web frontend, user input is not embedded correctly in the web page and… CVSS 3.1MEDIUM 6.1
- TI-2021-11767 The SEPPmail solution is vulnerable to a Cross-Site Scripting vulnerability (XSS)… CVSS 3.1MEDIUM 6.1
- TI-2026-21852 PDF Password CMDi CVSS 4.0CRITICAL 9.5
- TI-2026-21853 zip_attachments Path Traversal CVSS 4.0CRITICAL 9.3
- TI-2026-21854 S/MIME Decryption Tag Sanitization Bypass CVSS 4.0HIGH 8.2
- TI-2026-21855 Header Email Address Parsing CVSS 4.0HIGH 7.8
Sources
- CVE-2026-2743 · CVE Program
- CVE-2026-2743 · NVD
- FIRST EPSS
- GHSA-3hq3-ff7h-6mf5 · GitHub Advisory Database · CC BY 4.0
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