CVE-2021-3944

Cross-Site Request Forgery (CSRF) in bookstackapp/bookstack

3.1 LowFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.64%Unchanged since Dec 3, 2021

What each source reports

CVE List Score used 3.1

Cross-Site Request Forgery (CSRF) in bookstackapp/bookstack

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

Record: CVE-2021-3944
CVSS 3.0: 3.1 LowCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness: CWE-352
Updated: 2026-11-02

EUVDEUVD-2021-2601 3.1

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

Record: EUVD-2021-2601
CVSS 3.0: 3.1 LowCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-wc7v-77jr-5c3m 3.1

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

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

Record: GHSA-wc7v-77jr-5c3m
CVSS 3.0: 3.1 LowCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness: CWE-352
Updated: 2026-11-02

NVD 6.8

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

Record: CVE-2021-3944
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS 3.0: 3.1 LowCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS 2.0: 4.0 MediumAV:N/AC:H/Au:N/C:P/I:P/A:N
Weakness: CWE-352
Updated: 2026-11-02

OSV 6.8

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

Record: CVE-2021-3944
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVGHSA-wc7v-77jr-5c3m 3.1

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

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

Record: GHSA-wc7v-77jr-5c3m
CVSS 3.0: 3.1 LowCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness: CWE-352
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`ssddanbrown/bookstack` Packagist	before 21.11	21.11
`ssddanbrown/bookstack` Packagist	before 21.11, plus listed versions 0.7.2V0.7.5v0.10.0v0.11.0v0.11.1 Show 45 moreShow less v0.11.2v0.12.0v0.12.1v0.12.2v0.13.0v0.13.1v0.14.0v0.14.1v0.14.2v0.14.3v0.15.0v0.15.1v0.15.2v0.15.3v0.16.0v0.16.1v0.16.2v0.16.3v0.17.0v0.17.1v0.17.2v0.17.3v0.17.4v0.18.0v0.18.1v0.18.2v0.18.3v0.18.4v0.18.5v0.19.0v0.20.0v0.20.1v0.20.2v0.20.3v0.21.0v0.22.0v0.23.0v0.23.1v0.23.2v0.24.0v0.24.1v0.24.2v0.24.3v0.25.0v0.25.1	21.11

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3944 is a low vulnerability (CVSS 3.1) in Bookstackapp Bookstack, published December 2, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.64%, the 51st percentile. Fixed in ssddanbrown/bookstack 21.11.

References

This page doesn't list everything

Left out here: 79 versions. The JSON record has them.