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Fencer Vulns
medium 4.3

CVE-2021-4194 json

Improper Access Control in bookstackapp/bookstack

published 2022-01-06 4 y ago modified 2026-06-17 4 mo ago also GHSA-ghhm-xrwp-75m9 , EUVD-2022-0605

cvss
4.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

bookstack is vulnerable to Improper Access Control

Patch / fix

  • packagist ssddanbrown/bookstack 21.12.1
  • bookstackapp bookstackapp/bookstack 21.12.1

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/bookstackapp/bookstack/commit/cb0d674a71449de883713db2fcdccb6e108992ad referenced PoC, tagged "exploit" by a source, unverified
  • huntr.dev https://huntr.dev/bounties/0bc8b3f7-9057-4eb7-a989-24cd5689f114 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 4.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:P/A:N
GitHub 3.0 4.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist ssddanbrown/bookstack
<21.12.1
21.12.1

Affected products

  • bookstackapp bookstackapp/bookstack

Classification

Weakness
  • CWE-284 Improper Access Control
  • CWE-863 Incorrect Authorization
  • CWE-668 Exposure of Resource to Wrong Sphere

References

Sources

Fencer Vulns 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.