CVE-2021-3944: Bookstackapp Bookstack

Medium severity, CVSS 6.8. EPSS: 0.6% chance of exploitation in the next 30 days.

bookstack is vulnerable to Cross-Site Request Forgery (CSRF)

Affected products

• Bookstackapp Bookstack: before 21.11 (fixed in 21.11)

Published 2021-12-02. Last modified 2026-06-17.