EUVD-2026-31882
GHSA-j2q8-vw6h-chq2
Severity by source
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/E:X/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 Vendor (Joomla) · only source for this CVE.
CVSS VectorVendor: Joomla
Lifecycle Timeline
3DescriptionCVE.org
Lack of output escaping leads to a XSS vector in the multilingual associations component.
AnalysisAI
Cross-site scripting in Joomla! CMS's multilingual associations component (com_associations) allows an authenticated high-privilege attacker to inject malicious scripts that execute in another user's browser session, yielding high confidentiality impact on the vulnerable system. Affected installations span Joomla! CMS 4.0.0 through 5.4.5 and 6.0.0 through 6.1.0. SSVC assessment lists exploitation as none, EPSS is 0.04% (13th percentile), and no public exploit code or CISA KEV listing exists, indicating this is a low-urgency but genuine privilege-escalation-adjacent risk in multi-administrator Joomla environments.
Technical ContextAI
The com_associations component manages multilingual content linking in Joomla! CMS, connecting content items across language variants via a shared administrator UI. CWE-79 (Improper Neutralization of Input During Web Page Generation) identifies the root cause: user-supplied data stored or rendered within the associations interface is output to HTML without sufficient encoding, allowing injection of executable script content. The CVSS 4.0 vector confirms the flaw is network-reachable (AV:N), requires no special attack prerequisites beyond the standard application (AT:N), and has low attack complexity (AC:L), meaning exploitation is straightforward once access conditions are met. The vulnerable product is identified by CPE cpe:2.3:a:joomla!_project:joomla!_cms across the affected version ranges. The VC:H component score reflects that a successful XSS could expose sensitive data such as administrator session tokens or credentials within the vulnerable system boundary.
RemediationAI
Apply the vendor-released patch per the Joomla Security Centre advisory at https://developer.joomla.org/security-centre/1034-20260502-core-xss-in-com-associations.html; no specific patched version number is explicitly identified in the available intelligence, so consult the advisory directly to confirm the target upgrade version. As a compensating control for environments unable to patch immediately, consider disabling the com_associations component if multilingual content management is not in active use - note this will break cross-language content linking workflows. Restricting access to the associations manager to the minimum required set of administrator accounts reduces the pool of users who could inject a malicious payload. Implementing a Content Security Policy (CSP) header that disallows inline script execution will mitigate the impact of a successful XSS injection, though CSP configuration in Joomla may require template-level changes. Review VulDB entry https://vuldb.com/vuln/365733 for any additional technical detail.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today