EUVD-2026-82665
GHSA-8g63-4vhx-3q8r
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Unauthenticated remote submission (PR:N) but stored payload fires only when an admin views the page (UI:R), crossing into the admin browser context (S:C) with typical XSS C:L/I:L, no availability impact.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
6DescriptionCVE.org
The Easy Form Builder by WhiteStudio WordPress plugin before 4.2.0 does not validate a submitted value against the stored configuration for some of its form types, allowing unauthenticated users to store arbitrary content which is then rendered unescaped in an admin page, leading to Stored XSS.
AnalysisAI
Stored cross-site scripting (XSS) in the Easy Form Builder by WhiteStudio WordPress plugin (versions 4.0.0 up to but not including 4.2.0) lets unauthenticated attackers submit crafted values to certain form types that are stored and later rendered without escaping in an administrator-facing submissions page. Publicly available exploit code exists, and the vendor has released version 4.2.0 to fix the flaw. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the Easy Form Builder by WhiteStudio plugin (versions 4.0.0 up to but not including 4.2.0) to be installed and one of the affected form types to be publicly reachable, since the plugin fails to validate the submitted value against the stored form configuration - that missing server-side validation IS the enabling condition, needing no authentication (PR:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H = 8.8) overstates impact for what is fundamentally a stored XSS bug. … 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 Easy Form Builder by WhiteStudio plugin to version 4.2.0 or later; this is the exact vendor-released patch that resolves the missing validation. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress installations for Easy Form Builder by WhiteStudio and immediately update every instance running versions 4.0.0 up to but not including 4.2.0 to the vendor-released version 4.2.0; if immediate update is not possible, disable the plugin or restrict access to the plugin's admin submissions page and review recent form submissions for suspicious script content. …
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External POC / Exploit Code
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