Vulnerability Description
In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would run, within the context of the current page, when clicked or submitted. Additionally, a user with permissions to edit a page could insert a particular meta tag which could be used to silently redirect users to a alternative location upon visit of a page. Dangerous content may remain in the database but will be removed before being displayed on a page. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround without upgrading, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in BookStack version 0.30.4.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bookstackapp | Bookstack | < 0.30.4 |
Related Weaknesses (CWE)
References
- https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc39PatchThird Party Advisory
- https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4Release NotesThird Party Advisory
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgThird Party Advisory
- https://www.bookstackapp.com/blog/beta-release-v0-30-4/PatchVendor Advisory
- https://github.com/BookStackApp/BookStack/commit/bbd1384acbe7e52c21f89af69f2dc39PatchThird Party Advisory
- https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4Release NotesThird Party Advisory
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-r2cf-8778-3jgThird Party Advisory
- https://www.bookstackapp.com/blog/beta-release-v0-30-4/PatchVendor Advisory
FAQ
What is CVE-2020-26211?
CVE-2020-26211 is a vulnerability with a CVSS score of 7.7 (HIGH). In BookStack before version 0.30.4, a user with permissions to edit a page could insert JavaScript code through the use of `javascript:` URIs within a link or form which would run, within the context ...
How severe is CVE-2020-26211?
CVE-2020-26211 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-26211?
Check the references section above for vendor advisories and patch information. Affected products include: Bookstackapp Bookstack.