EUVD-2026-17857Severity by source
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
Lack of output escaping leads to a XSS vector in the multilingual associations component.
AnalysisAI
Cross-site scripting (XSS) in Joomla CMS multilingual associations component allows unauthenticated remote attackers to inject malicious scripts via unescaped output in the comparison view. The vulnerability affects all versions of Joomla CMS and stems from improper output encoding in the com_associations component. No CVSS score is available; however, the CWE-79 classification confirms reflected or stored XSS capability.
Technical ContextAI
The vulnerability exists in Joomla CMS's multilingual associations component (com_associations), specifically in the comparison view functionality. CWE-79 identifies the root cause as improper neutralization of input during web page generation, meaning user-controlled data is rendered in HTML/JavaScript context without adequate escaping or encoding. The Joomla framework provides output escaping functions (e.g., HTMLspecialchars, JSON encoding) that should have been applied to multilingual association data before rendering to the browser. The absence of these protections allows attackers to inject arbitrary HTML and JavaScript that executes in the victim's browser session, potentially enabling credential theft, session hijacking, or malware distribution.
RemediationAI
Apply the security patch released by Joomla Project as documented in their security advisory at https://developer.joomla.org/security-centre/1029-20260303-core-xss-vector-in-com-associations-comparison-view.html. The patch addresses output escaping in the com_associations comparison view to prevent XSS injection. If a patched version is not immediately available, disable or restrict access to the multilingual associations component through administrator control panel access controls or web server rules until the patch can be deployed. Ensure all Joomla installations are kept current with security updates and consider implementing Content Security Policy (CSP) headers as a defense-in-depth measure.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today