CVE-2026-21631— Joomla! Core - [20260303] - XSS vector in com_associations comparison view
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-21631
Vulnerability Information
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Vulnerability Title
Joomla! Core - [20260303] - XSS vector in com_associations comparison view
Source: CVE Program / CVE List V5
Vulnerability Description
Lack of output escaping leads to a XSS vector in the multilingual associations component.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U
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
Joomla! CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joomla! CMS是Joomla!开源的一个内容管理系统。 Joomla! CMS存在安全漏洞，该漏洞源于缺少输出转义，可能导致多语言关联组件中存在跨站脚本向量。
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 |
|---|---|---|---|---|
| Joomla! Project | Joomla! CMS | 4.0.0-5.4.3 | - |
II. Public POCs for CVE-2026-21631
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
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Vendor Advisories for CVE-2026-21631 (1)
Other References for CVE-2026-21631 (1)
Same Patch Batch · Joomla! Project · 2026-04-01 · 6 CVEs total
| CVE-2026-23898 | 8.6 HIGH | Joomla! Core - [20260305] - Arbitrary file deletion in com_joomlaupdate |
| CVE-2026-21630 | Joomla! Core - [20260302] - SQL injection in com_content articles webservice endpoint | |
| CVE-2026-21629 | Joomla! Core - [20260301] - ACL hardening in com_ajax | |
| CVE-2026-21632 | Joomla! Core - [20260304] - XSS vectors in various article title outputs | |
| CVE-2026-23899 | Joomla! Core - [20260306] - Improper access check in webservice endpoints |
IV. Related Vulnerabilities
Same product: Joomla! CMS
- CVE-2026-71573
Joomla! Core - [20260802] - Improper CORS origin validation - CVE-2026-72531
Joomla! Core - [20260804] - Improper ACL checks for custom f - CVE-2026-73336
Joomla! Core - [20260806] - XSS through schema.org outputs i - CVE-2026-73372
Joomla! Core - [20260809] - Improper ACL checks when injecti - CVE-2026-71572
Joomla! Core - [20260801] - Response header injection in dow
Same vendor: Joomla! Project
- CVE-2026-71573
Joomla! Core - [20260802] - Improper CORS origin validation - CVE-2026-72531
Joomla! Core - [20260804] - Improper ACL checks for custom f - CVE-2026-73336
Joomla! Core - [20260806] - XSS through schema.org outputs i - CVE-2026-73372
Joomla! Core - [20260809] - Improper ACL checks when injecti - CVE-2026-71572
Joomla! Core - [20260801] - Response header injection in dow
Same weakness: CWE-79
- CVE-2026-76612
Joomla Extension - yootheme.com - Unauthenticated stored XSS - CVE-2026-77028
Joomla Extension - yootheme.com - Reflected XSS and open red - CVE-2026-73537
Miraikan Assist App跨站脚本漏洞 - CVE-2026-18409
WPForms Pro <= 2.0.0.2 - Unauthenticated Stored Cross-Site S - CVE-2026-65644
Rocket.Chat多个版本REST API反射型XSS漏洞
V. Comments for CVE-2026-21631
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