CVE Watch2 sept 2026

CVE-2026-84695

BookStack before 26.05.4 contains a stored cross-site scripting vulnerability in the drawing upload endpoint that accepts unvalidated base64

CVSS

8.7

Alto

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 2 sept 2026 · Última mod.: 2 sept 2026 · CWE-79

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

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.

Referencias oficiales

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