Description
BookStack before 26.05.4 contains a stored cross-site scripting vulnerability in the drawing upload endpoint that accepts unvalidated base64 content and stores it without content inspection. Attackers with editor permissions can upload SVG files containing scripts that execute in administrator browsers when accessed through the image gallery API without content-type validation or CSP headers.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
bookstackapp bookstack
Default version status: unaffected
0 to < 26.05.4affected26.05.4unaffected
pkg:github/BookStackApp/BookStackReferences
- https://github.com/BookStackApp/BookStack ↗
- https://github.com/BookStackApp/BookStack/commit/ac0348a79f3ddd004ca87703948cb9c7d19a420a ↗
- https://github.com/BookStackApp/BookStack/blob/v26.05.3/app/Uploads/ImageService.php ↗
- https://github.com/BookStackApp/BookStack/releases/tag/v26.05.4 ↗
- https://www.bookstackapp.com/blog/bookstack-release-v26-05-4/ ↗
- https://www.vulncheck.com/advisories/bookstack-before-26.05.4-stored-xss-via-drawing-upload ↗