CVE-2026-84695

CVSS 9.3 (critical) · published 2026-09-02

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.

Weakness: CWE-79

Source: NVD CVE-2026-84695

References

• https://github.com/BookStackApp/BookStack
• https://github.com/BookStackApp/BookStack/blob/v26.05.3/app/Uploads/ImageService.php
• https://github.com/BookStackApp/BookStack/commit/ac0348a79f3ddd004ca87703948cb9c7d19a420a
• 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

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