Cross-Site Scripting in BookStack
Moderate severity
GitHub Reviewed
Published
May 2, 2020
in
BookStackApp/BookStack
•
Updated Jan 9, 2023
Package
Affected versions
>= 0.18.0, < 0.29.2
Patched versions
0.29.2
Description
Reviewed
May 7, 2020
Published to the GitHub Advisory Database
May 7, 2020
Last updated
Jan 9, 2023
Impact
A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines.
This most impacts scenarios where not-trusted users are given permission to create comments.
Patches
The issue was addressed in BookStack v0.29.2.
After upgrading, The command
php artisan bookstack:regenerate-comment-contentshould be ran to remove any pre-existing dangerous content.Workarounds
Comments can be disabled in the system settings to prevent them being shown to users. Alternatively, comment creation permissions can be altered as required to only those who are trusted but this will not address existing exploitation of this vulnerability.
References
For more information
If you have any questions or comments about this advisory:
References