PT-2026-83429 · Bookstackapp · Bookstack
CVE-2026-82450
·
Published
2026-08-29
·
Updated
2026-08-29
CVSS v3.1
8.8
High
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
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.
Fix
Unrestricted File Upload
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Weakness Enumeration
Related Identifiers
Affected Products
Bookstack