CVE-2021-4194: Bookstackapp Bookstack

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

bookstack is vulnerable to Improper Access Control

Affected products

• Bookstackapp Bookstack: before 21.12.1 (fixed in 21.12.1)

Published 2022-01-06. Last modified 2026-06-17.