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CVE-2026-48903— Joomla! Framework - [20260519] - Inadequate content filtering within the checkAttribute filter code.

Quick assessment

Affected
Joomla! Project Joomla! Framework Filter package
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.

Joomla!是Joomla!开源的一个自由、开放源代码的内容管理系统。 Joomla! Framework存在跨站脚本漏洞，该漏洞源于checkAttribute方法中内容过滤不足，导致各种组件存在跨站脚本漏洞。

AI Predicted 6.1 Difficulty: Easy EPSS 0.24% · P14

Affected Version Matrix 2

VendorProduct Version RangeStatus
Joomla! Project Joomla! Framework Filter package 1.0.0-3.0.5 affected
4.0.0-4.0.1 affected
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I. Basic Information for CVE-2026-48903

Vulnerability Information
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Vulnerability Title
Joomla! Framework - [20260519] - Inadequate content filtering within the checkAttribute filter code.
Source: CVE Program / CVE List V5
Vulnerability Description
Inadequate content filtering within the checkAttribute methods leads to XSS vulnerabilities in various components.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA: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
Joomla! 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joomla!是Joomla!开源的一个自由、开放源代码的内容管理系统。 Joomla! Framework存在跨站脚本漏洞，该漏洞源于checkAttribute方法中内容过滤不足，导致各种组件存在跨站脚本漏洞。
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! Framework Filter package 1.0.0-3.0.5 -

II. Public POCs for CVE-2026-48903

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III. Intelligence Information for CVE-2026-48903

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Vendor Advisories for CVE-2026-48903 (1)

Same Patch Batch · Joomla! Project · 2026-05-26 · 20 CVEs total

CVE-2026-48904 Joomla! Core - [20260514] - Privilege escalation through com_users webservice endpoints
CVE-2026-30894 Joomla! Core - [20260503] - XSS in com_contenthistory
CVE-2026-30895 Joomla! Core - [20260504] - XSS in readmore links
CVE-2026-40383 Joomla! Core - [20260509] - LFI in HTMLView layout parameter
CVE-2026-40384 Joomla! Core - [20260510] - Path traversal in com_media webservice endpoint
CVE-2026-35221 Joomla! Core - [20260506] - Authenticated blind SQLi in com_finder
CVE-2026-35222 Joomla! Core - [20260507] - Authenticated blind SQLi in com_tags
CVE-2026-35220 Joomla! Core - [20260505] - CSRF in user activation endpoint
CVE-2026-35223 Joomla! Core - [20260508] - Improper access check in com_config webservice endpoints
CVE-2026-48905 Joomla! Framework - [20260520] - Inadequate content filtering within the cleanAttributes f
CVE-2026-25901 Joomla! Core - [20260502] - XSS in com_associations
CVE-2026-48897 Joomla! Core - [20260512] - MFA Authentication Bypass
CVE-2026-48896 Joomla! Core - [20260511] - MFA Authentication Bypass
CVE-2026-48898 Joomla! Core - [20260513] - Privilege escalation through com_users batch task
CVE-2026-48899 Joomla! Core - [20260515] - Incorrect Access Control in sample data plugins
CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset
CVE-2026-48900 Joomla! Core - [20260516] - Incorrect Access Control in com_scheduler
CVE-2026-48901 Joomla! Core - [20260517] - Incorrect Cache Key Construction for InputFilter objects
CVE-2026-25900 Joomla! Core - [20260501] - XSS in feed modules

IV. Related Vulnerabilities

Same product: Joomla! Framework Filter package
Same vendor: Joomla! Project
Same weakness: CWE-79

V. Comments for CVE-2026-48903

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