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CVE-2026-84695— BookStack before 26.05.4 Stored XSS via Drawing Upload

Quick assessment

Affected
bookstackapp bookstack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BookStackApp BookStack是BookStackApp组织开源的一款文档管理系统。 BookStackApp BookStack 26.05.4之前版本存在跨站脚本漏洞，该漏洞源于绘图上传端点接受未经验证的base64内容并存储时未进行内容检查，容易受到存储型跨站脚本攻击，具有编辑器权限的攻击者可上传包含脚本的SVG文件，通过图片库API访问时因缺少内容类型验证或CSP头，导致脚本在管理员浏览器中执行。

CVSS 8.7 · High EPSS 0.47% · P40

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
bookstackapp bookstack < 26.05.4 affected
26.05.4 unaffected
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I. Basic Information for CVE-2026-84695

Vulnerability Information
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Vulnerability Title
BookStack before 26.05.4 Stored XSS via Drawing Upload
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
BookStackApp BookStack 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BookStackApp BookStack是BookStackApp组织开源的一款文档管理系统。 BookStackApp BookStack 26.05.4之前版本存在跨站脚本漏洞，该漏洞源于绘图上传端点接受未经验证的base64内容并存储时未进行内容检查，容易受到存储型跨站脚本攻击，具有编辑器权限的攻击者可上传包含脚本的SVG文件，通过图片库API访问时因缺少内容类型验证或CSP头，导致脚本在管理员浏览器中执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bookstackapp bookstack 0 ~ 26.05.4 -

II. Public POCs for CVE-2026-84695

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III. Intelligence Information for CVE-2026-84695

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Patches & Fixes for CVE-2026-84695 (2)

Vendor Advisories for CVE-2026-84695 (1)

Security Blog Posts for CVE-2026-84695 (1)

Vendor Pages for CVE-2026-84695 (1)

Other References for CVE-2026-84695 (1)

IV. Related Vulnerabilities

Same product: bookstack
Same vendor: bookstackapp
Same weakness: CWE-79

V. Comments for CVE-2026-84695

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