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CVE-2026-82450
BookStack before 26.05.4 contains a remote code execution vulnerability in the portable ZIP import functionality that allows users with Import Content and Crea…
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| BookStack | before 26.05.4 |
Versions were read from the advisory text. No structured product data has been published for this record yet.