EUVD-2026-42059
GHSA-2hjh-jp76-w6fv
Severity 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
PR:H reflects mandatory admin access; UI:R captures victim page-load dependency; S:C applies because payload executes in a different user's browser context.
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
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
Lifecycle Timeline
1DescriptionCVE.org
Improper validation leads to a generic XSS vector in the language override feature.
AnalysisAI
Stored XSS in Joomla CMS's language override administrative feature allows a high-privileged attacker to inject malicious scripts that execute in the browser of any user who subsequently renders the affected language string. Rooted in CWE-79 (improper output neutralization), the vulnerability requires an administrative account to place the payload but can then target other admins or front-end users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a high-privileged Joomla account (PR:H) - an administrator or super-administrator role with write access to the language override management panel in the Joomla back-end. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.9 (Medium) accurately reflects the PR:H requirement, which meaningfully constrains exploitability: an attacker must already control a high-privileged Joomla account - typically a super-administrator or administrator with back-end access - before the vulnerability can be triggered. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A malicious or compromised Joomla administrator logs into the back-end and navigates to the language override manager, injecting a JavaScript payload (e.g., a script that exfiltrates document.cookie to an attacker-controlled server) into a frequently rendered language string. When another administrator or an authenticated front-end user visits a page that renders the poisoned string, the script executes silently in their browser, enabling session hijacking or account takeover. … |
| Remediation | Apply the patch or upgrade to the fixed Joomla CMS version identified in the official Joomla Security Centre advisory published 2026-07-08 at https://developer.joomla.org/security-centre/1062-20260708-core-xss-through-language-overrides.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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