CVE-2026-84695

Katalog CVE

CVSS 8.7 · High EPSS 0,47%

Kerentanan Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). Skor CVSS 3.1 8.7 (High) menurut vulncheck.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

2 September 2026

Terakhir diubah

8 September 2026

Status NVD

Deferred

CVSS 3.1

8.7 (High), sumber vulncheck.com
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

EPSS (30 hari)

0,47% peluang dieksploitasi; lebih tinggi dari 38,9% CVE lain

Produk dan versi terdampak

NVD belum mencantumkan data produk (CPE) untuk CVE ini. Produk yang terdampak biasanya disebut di deskripsi dan di advisory vendor pada daftar referensi.

Referensi dan perbaikan

• 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