CVE-2021-3944

Name: CVE-2021-3944
Creator: NVD / NIST
Published: 2021-12-02T17:15:08.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2021-3944 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. bookstack is vulnerable to Cross-Site Request Forgery (CSRF). EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

6.8/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS Probability

0.62%

45.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Bookstackapp	Bookstack	< 21.11

References

https://github.com/bookstackapp/bookstack/commit/88e6f93abf54192a69cc8080e0dc6516ee68ccbbPatch, Third Party Advisory
https://huntr.dev/bounties/65551490-5ade-49aa-8b8d-274c2ca9fdc9Exploit, Patch, Third Party Advisory
https://github.com/bookstackapp/bookstack/commit/88e6f93abf54192a69cc8080e0dc6516ee68ccbbPatch, Third Party Advisory
https://huntr.dev/bounties/65551490-5ade-49aa-8b8d-274c2ca9fdc9Exploit, Patch, Third Party Advisory

Timeline

Published: Dec 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3944?

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

How severe is CVE-2021-3944?

CVE-2021-3944 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3944?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3944?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST