Vulnerability-Lookup

GHSA-3HQ3-FF7H-6MF5

Vulnerability from github – Published: 2026-03-05 09:30 – Updated: 2026-05-18 18:31

Details

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

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

10.0 (Critical)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-2743"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-05T07:16:14Z",
    "severity": "CRITICAL"
  },
  "details": "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",
  "id": "GHSA-3hq3-ff7h-6mf5",
  "modified": "2026-05-18T18:31:23Z",
  "published": "2026-03-05T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2743"
    },
    {
      "type": "WEB",
      "url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html"
    },
    {
      "type": "WEB",
      "url": "https://labs.infoguard.ch/advisories/seppmail"
    },
    {
      "type": "WEB",
      "url": "https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-2743 (GCVE-0-2026-2743)

Vulnerability from cvelistv5 – Published: 2026-03-05 06:45 – Updated: 2026-05-19 19:44

Title

SEPPmail User Web Interface Arbitrary File Write to RCE

Summary

Severity

10 (Critical)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-19 19:43 UTC

CWE

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

Assigner

NCSC.ch mitre root

References

2 references

URL	Tags
https://downloads.seppmail.com/extrelnotes/150/ER…
https://labs.infoguard.ch/posts/seppmail_secure_e…

Impacted products

1 product

Vendor	Product	Version
SeppMail	SeppMail	Affected: unknown , ≤ 15.0.2.1 (-)

Credits

Manuel Feifel and Dario Weiss of InfoGuard Labs

Show details on NVD website

JSON

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  "containers": {
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        "metrics": [
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                "id": "CVE-2026-2743",
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                  },
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                  },
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-19T19:43:50.041616Z",
                "version": "2.0.3"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.