CVE-2021-3758: Bookstackapp Bookstack

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

bookstack is vulnerable to Server-Side Request Forgery (SSRF)

Affected products

• Bookstackapp Bookstack: before 21.08 (fixed in 21.08)

Published 2021-09-02. Last modified 2026-06-17.