Medium severity · published Dec 2, 2021
CVE-2021-3944
bookstack is vulnerable to Cross-Site Request Forgery (CSRF)
6.8
CVSS
0.6%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BO
Bookstack · Bookstackapp
before 21.11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3944
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3944
Patch
https://github.com/bookstackapp/bookstack/commit/88e6f93abf54192a69cc8080e0dc6516ee68ccbb
Exploit
https://huntr.dev/bounties/65551490-5ade-49aa-8b8d-274c2ca9fdc9
More from Bookstack
9.8
CVE-2021-4119
bookstack is vulnerable to Improper Access Control
8.8
CVE-2026-82450
BookStack before 26.05.4 Remote Code Execution via Book Cover
8.8
CVE-2020-5256
BookStack before version 0.25.5 has a vulnerability where a user could upload PHP files through image upload functions, which would allow them to execute code on the host system…
8.7
CVE-2026-84695
BookStack before 26.05.4 Stored XSS via Drawing Upload
8.7
CVE-2020-26211
In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would…