Cross-Site Scripting in BookStack
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-content should 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
- BookStack Beta v0.29.2
- JVN#41035278
- BookStack Blog Post
For more information
If you have any questions or comments about this advisory:
- Open an issue in the BookStack GitHub repository.
- Ask on the BookStack Discord chat.
- Follow the BookStack Security Advice to contact someone privately.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | ssddanbrown/bookstack | >= 0.18.0, < 0.29.2 | 0.29.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
ssddanbrown/bookstack- Disclosed
- 07.05.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-5vf7-q87h-pg6w - CC BY 4.0
Vulnerability history: ssddanbrown/bookstack
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 10
- First → latest
- 03.2020 07.2024
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 5
- Low 1
Disclosures per year
- 2020: 2
- 2021: 4
- 2022: 3
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 0
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