CVE-2021-4026 Improper Access Control in bookstackapp/bookstack
Attackers can bypass access controls to read or modify unauthorized data in BookStack documentation software.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4026?
CVE-2021-4026 is a medium-severity missing authorization vulnerability in bookstackapp/bookstack, published on 30 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
bookstack is vulnerable to Improper Access Control
Which versions are affected by CVE-2021-4026?
2 open source packages ship an affected version, including ssddanbrown/bookstack. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
ssddanbrown/bookstack Packagist | All versions | 21.11.2 |
ssddanbrown/bookstack Packagist | All versions | 21.11.2 |
Products include Bookstackapp Bookstack.
How do I fix CVE-2021-4026?
Upgrade ssddanbrown/bookstack to 21.11.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-4026 being exploited?
There is no known exploitation of CVE-2021-4026 in the wild and no public exploit code.
Other vulnerabilities in bookstackapp/bookstack
- CVE-2020-5256 Remote Code Execution Through Image Uploads in BookStack
- CVE-2020-26210 Cross-Site Scripting in BookStack
- CVE-2020-26211 Cross-Site Scripting in BookStack
- CVE-2022-0877 Cross-site Scripting (XSS) - Stored in bookstackapp/bookstack
- CVE-2021-3915 Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
Sources
Also known as GHSA-jm6p-wfjg-xm7x.