VULNERABILITY INTELLIGENCE
CVE-2026-84695
CVSS score8.7 HIGH
EPSS probability0.47%
CISA KEVNot currently listed
Published2026-09-02
Last modified2026-09-08
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-79