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Fencer Intel
low 3.1

CVE-2021-3944 json

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

published 4y ago modified 4mo ago also GHSA-wc7v-77jr-5c3m , EUVD-2021-2601

cvss
3.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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

Patch / fix

  • packagist ssddanbrown/bookstack 21.11
  • bookstackapp bookstackapp/bookstack 21.11

Is CVE-2021-3944 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/65551490-5ade-49aa-8b8d-274c2ca9fdc9 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 3.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD 2.0 4.0 AV:N/AC:H/Au:N/C:P/I:P/A:N
GitHub 3.0 3.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist ssddanbrown/bookstack
<21.11
21.11

Affected products

  • bookstackapp bookstackapp/bookstack

Classification

Weakness
  • CWE-352 Cross-Site Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.