Security Advisory

CVE-2026-82450

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-29 13:47:53

Last updated 2026-08-31 18:21:21

Assigner VulnCheck

CVSS score 8.8

State PUBLISHED

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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