CVE-2026-82450

نوع الضعف

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.

المراجع

• https://github.com/BookStackApp/BookStack
• https://github.com/BookStackApp/BookStack/commit/e210cc32e4cbb1efeae5c5c9d0fef8e3c6a752e6
• https://www.vulncheck.com/advisories/bookstack-before-26.05.4-remote-code-execution-via-book-cover