CVE-2021-4026

Public Exploit
Improper Access Control in bookstackapp/bookstack

Description

bookstack is vulnerable to Improper Access Control

Categories

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.20%
Third-Party Advisory github.com Third-Party Advisory huntr.dev
Affected: bookstackapp bookstackapp/bookstack
Published at:
Updated at:

References

Link Tags
https://huntr.dev/bounties/c6dfa80d-43e6-4b49-95af-cc031bb66b1d third party advisory exploit
https://github.com/bookstackapp/bookstack/commit/b4fa82e3298a15443ca40bff205b7a16a1031d92 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-4026?
CVE-2021-4026 has been scored as a medium severity vulnerability.
How to fix CVE-2021-4026?
To fix CVE-2021-4026, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4026 being actively exploited in the wild?
It is possible that CVE-2021-4026 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4026?
CVE-2021-4026 affects bookstackapp bookstackapp/bookstack.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.