EUVD-2026-77312
GHSA-jrxp-wh39-qfvp
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/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:N/AU:N/R:X/V:X/RE:X/U:X
High privilege required to author modal content (PR:H); victim's passive page visit is the trigger (UI:R); scope changes as payload executes in visitor's browser context (S:C).
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
Lifecycle Timeline
3DescriptionCVE.org
Joomla Extension - regularlabs.com - Privileged stored XSS via executable URL schemes in Modals extension for Joomla < 17.0.0 - Modals treats a destination using an executable browser URL scheme as an ordinary modal URL. The value can reach both the generated link and the iframe-loading path. Authored content can consequently become JavaScript in a visitor's browser without using Modals' separate Pro JavaScript Events feature.
AnalysisAI
Stored cross-site scripting in the Regular Labs Modals extension for Joomla (all versions before 17.0.0) allows high-privileged content authors to inject executable browser URL schemes - such as javascript: - into modal destination fields, which the extension passes unvalidated into both the generated anchor href and the iframe source path. When any site visitor subsequently renders the affected page, the stored payload executes as JavaScript in their browser without requiring the Pro JavaScript Events feature to be enabled. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Joomla user account with content-authoring privileges at editor level or higher (captured by PR:H in the CVSS vector), sufficient to create or edit a modal entry in the Modals extension. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 7.5 (AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L) reflects high downstream confidentiality and integrity impact but is substantially constrained by PR:H - requiring an authenticated, high-privilege Joomla authoring account. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade the Regular Labs Modals extension to version 17.0.0 or later, which is the vendor-confirmed fix per https://www.regularlabs.com/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Joomla installations to identify if Regular Labs Modals is deployed and document current extension versions. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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