SEPTEMBER 18, 2026
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Case File

CVE-2026-84695

HIGH · CVSS 8.7 EPSS 0.26% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-02 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

BookStack versions prior to 26.05.4 are vulnerable to a stored cross-site scripting (XSS) flaw in the drawing upload endpoint, allowing attackers with editor permissions to upload malicious SVG files. This vulnerability can lead to the execution of scripts in the browsers of administrators accessing the image gallery API, posing a significant risk to the integrity of the application. Organizations using affected versions should prioritize patching to mitigate potential exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗ github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-84695
Severity
HIGH
CVSS
8.7
EPSS
0.26%

Original NVD 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.