CVE-2021-3915: Bookstackapp Bookstack

Medium severity, CVSS 5.7. EPSS: 1% chance of exploitation in the next 30 days.

bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type

Affected products

• Bookstackapp Bookstack: before 21.10.3 (fixed in 21.10.3)

Published 2021-11-13. Last modified 2026-06-17.