CVE-2026-82450 | BDVDB-2026-366269 Detail

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.

Impact#

Weaknesses#

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Exploit#

History#

1. Version 12026-08-29Record published in the CVE List.
2. Version 22026-10-08Most recent update recorded in the CVE List.