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CVE-2021-4026— Improper Access Control in bookstackapp/bookstack

Quick assessment

Affected
bookstackapp 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.

BookStack是BookStackApp（Bookstackapp）团队的一套开源的使用PHP和Laravel构建wiki文档的平台。 bookstackapp存在访问控制错误漏洞，该漏洞源于具有API访问权限的用户可以查看他们没有读取权限的任何附件。

AI Predicted 9.1 Difficulty: Easy EPSS 0.90% · P56

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2021-4026

Vulnerability Information
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Vulnerability Title
Improper Access Control in bookstackapp/bookstack
Source: CVE Program / CVE List V5
Vulnerability Description
bookstack is vulnerable to Improper Access Control
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
BookStack 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BookStack是BookStackApp（Bookstackapp）团队的一套开源的使用PHP和Laravel构建wiki文档的平台。 bookstackapp存在访问控制错误漏洞，该漏洞源于具有API访问权限的用户可以查看他们没有读取权限的任何附件。
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 bookstackapp/bookstack unspecified ~ 21.11.2 -

II. Public POCs for CVE-2021-4026

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-4026

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Vendor Advisories for CVE-2021-4026 (1)

IV. Related Vulnerabilities

Same product: bookstackapp/bookstack
Same vendor: bookstackapp
Same weakness: CWE-284

V. Comments for CVE-2021-4026

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