CVE-2021-4119: Bookstackapp Bookstack

Critical severity, CVSS 9.8. EPSS: 26.9% chance of exploitation in the next 30 days.

bookstack is vulnerable to Improper Access Control

Affected products

• Bookstackapp Bookstack: up to and including 21.11.2

Published 2021-12-15. Last modified 2026-06-17.