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CVE-2020-21494

Quick assessment

Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xiuno BBS是一款基于PHP和MySQL的开源论坛程序。 Xiuno BBS 中存在跨站脚本漏洞，该漏洞源于产品中的installinstall.sql组件未能正确验证用户输入数据。攻击者可通过将doctype修改为0来执行任意的web脚本及HTML。以下产品及版本受到影响：Xiuno BBS 4.0.4。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.69% · P51
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I. Basic Information for CVE-2020-21494

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A cross-site scripting (XSS) vulnerability in the component install\install.sql of Xiuno BBS 4.0.4 allows attackers to execute arbitrary web scripts or HTML via changing the doctype value to 0.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xiuno BBS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xiuno BBS是一款基于PHP和MySQL的开源论坛程序。 Xiuno BBS 中存在跨站脚本漏洞，该漏洞源于产品中的installinstall.sql组件未能正确验证用户输入数据。攻击者可通过将doctype修改为0来执行任意的web脚本及HTML。以下产品及版本受到影响：Xiuno BBS 4.0.4。
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
- n/a n/a -

II. Public POCs for CVE-2020-21494

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 3578 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2020-21494

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Other References for CVE-2020-21494 (2)

Same Patch Batch · n/a · 2021-10-04 · 42 CVEs total

CVE-2021-38618 7.4 HIGH Mitre Corporation Gfos Workforce Management 授权问题漏洞
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CVE-2021-40683 Akamai Enterprise Application Access Client 代码问题漏洞
CVE-2021-41867 OnionShare 安全漏洞
CVE-2021-38823 IceHrm 代码问题漏洞
CVE-2021-38822 IceHrm 跨站脚本漏洞
CVE-2021-41868 OnionShare 安全漏洞
CVE-2021-39486 Gila CMS 跨站脚本漏洞
CVE-2021-37777 Gila CMS 信息泄露漏洞
CVE-2021-37333 Laravel Booking System Booking Core 代码问题漏洞
CVE-2021-37331 Booking Core 授权问题漏洞
CVE-2021-41595 SuiteCRM 路径遍历漏洞
CVE-2021-41511 Lodging Reservation Management System SQL注入漏洞
CVE-2021-41878 i-Panel Administration System 跨站脚本漏洞
CVE-2021-41869 SuiteCRM 安全漏洞
CVE-2021-41322 Polycom Vvx 400/410 安全漏洞
CVE-2021-41285 Crucial Ballistix Mod Utility 安全漏洞
CVE-2021-40325 Cobbler 安全漏洞
CVE-2021-40324 Cobbler 代码问题漏洞
CVE-2021-40323 Cobbler 代码注入漏洞

Showing top 20 of 42 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a

V. Comments for CVE-2020-21494

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