CVE-2026-84695 — BookStack before 26.05.4 Stored XSS via Drawing Upload
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 conten…
Published: 2026-09-02 · CVSS: 9.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7