CVE-2021-4194

Name: CVE-2021-4194
Creator: NVD / NIST
Published: 2022-01-06T18:15:07.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2021-4194 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. bookstack is vulnerable to Improper Access Control. EPSS estimates a 0.71% chance of exploitation in the next 30 days.

Description

bookstack is vulnerable to Improper Access Control

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.71%

48.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Bookstackapp	Bookstack	< 21.12.1

References

https://github.com/bookstackapp/bookstack/commit/cb0d674a71449de883713db2fcdccb6e108992adExploit, Third Party Advisory
https://huntr.dev/bounties/0bc8b3f7-9057-4eb7-a989-24cd5689f114Exploit, Third Party Advisory
https://github.com/bookstackapp/bookstack/commit/cb0d674a71449de883713db2fcdccb6e108992adExploit, Third Party Advisory
https://huntr.dev/bounties/0bc8b3f7-9057-4eb7-a989-24cd5689f114Exploit, Third Party Advisory

Timeline

Published: Jan 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4194?

bookstack is vulnerable to Improper Access Control

How severe is CVE-2021-4194?

CVE-2021-4194 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4194?

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-2021-4194?

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

Scan your code now

Source: NVD / NIST