CVE-2021-4119

Name: CVE-2021-4119
Creator: NVD / NIST
Published: 2021-12-15T20:15:08.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 26.89%

Last modified Jun 17, 2026

CVE-2021-4119 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. bookstack is vulnerable to Improper Access Control. EPSS estimates a 26.89% chance of exploitation in the next 30 days.

Description

bookstack is vulnerable to Improper Access Control

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

26.89%

97.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Bookstackapp	Bookstack	<= 21.11.2

References

https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99Patch, Third Party Advisory
https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fcaExploit, Patch, Third Party Advisory
https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99Patch, Third Party Advisory
https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fcaExploit, Patch, Third Party Advisory

Timeline

Published: Dec 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4119?

bookstack is vulnerable to Improper Access Control

How severe is CVE-2021-4119?

CVE-2021-4119 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 26.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4119?

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-2021-4119?

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

Scan your code now

Source: NVD / NIST