BookStack is a platform for storing and organising information and documentation. In BookStack before version 0.30.5, a user with permissions to edit a page could set certain image URL’s to manipulate functionality in the exporting system, which would allow them to make server side requests and/or have access to a wider scope of files within the BookStack file storage locations. The issue was addressed in BookStack v0.30.5. As a workaround, page edit permissions could be limited to only those that are trusted until you can upgrade.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26260
Reference (s):
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr
- URL: https://github.com/BookStackApp/BookStack/security/advisories/GHSA-8wfc-w2r5-x7cr
- https://bookstackapp.com/blog/beta-release-v0-30-5/
- URL: https://bookstackapp.com/blog/beta-release-v0-30-5/
- https://github.com/BookStackApp/BookStack/releases/tag/v0.30.5