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Unrestricted Upload of File with Dangerous Type

CVE-2026-38991

High
8.8/10

Summary

Cockpit versions through 2.13.5 is affected by a misconfiguration within the Bucket component `_isFileTypeAllowed` function where a specially crafted filename bypasses an extension filter. This allows an authenticated attacker to rename arbitrary files with the `.php` file extension enabling arbitrary code to be executed on the underlying server.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • LOW
  • HIGH
  • HIGH

CWE-434 - Unrestricted Upload of File with dangerous type

'Unrestricted file upload with dangerous type' attacks involve an attacker uploading or transferring files of dangerous types to the server. The severity of such an attack depends upon the execution mechanism and the storage location of the uploaded file. Thus, it may range from simple defacement to arbitrary file execution, and complete system takeover.

References

Advisory Timeline

  • Published