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Advisories

BookStack before 26.05.4 Remote Code Execution via Book Cover

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severity
high
date
Affecting

  • bookstack >= 0, < 26.05.4

CWE
  • CWE-434 Unrestricted Upload of File with Dangerous Type
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Submersion.ai Security Research Team
Description
BookStack before 26.05.4 contains a remote code execution vulnerability in the portable ZIP import functionality that allows users with Import Content and Create Books permissions to upload a PHP polyglot file as a book cover. Attackers can bypass image extension validation by embedding a PHP file with a .php filename in the ZIP archive, which is stored in the public web root and executed by unauthenticated requests.

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