What’s Vulnerable › Vulnerabilities

CVE-2021-3944: Cross-Site Request Forgery (CSRF) in bookstackapp/bookstack

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-02 · updated 2026-06-17
• Weakness: CWE-352

Description

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

Affected products

• bookstackapp/bookstack: before 21.11 — fixed in 21.11

How to fix

Upgrade to a fixed version: bookstackapp/bookstack 21.11. Check the vendor advisory for mitigations.

References

• https://github.com/bookstackapp/bookstack/commit/88e6f93abf54192a69cc8080e0dc6516ee68ccbb
• https://huntr.dev/bounties/65551490-5ade-49aa-8b8d-274c2ca9fdc9
• https://github.com/bookstackapp/bookstack/commit/88e6f93abf54192a69cc8080e0dc6516ee68ccbb
• https://huntr.dev/bounties/65551490-5ade-49aa-8b8d-274c2ca9fdc9

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