Reflected XSS via unescaped form size
Published Jul 16, 2026 · Updated Jul 16, 2026
Reflected XSS in FunnelKit Funnel Builder before 3.15.0.6 allows remote attackers to execute script through a crafted Divi AJAX request. The et_wfop_optin_form action writes the request's input_size value unescaped inside a style block, allowing a closing tag to introduce script. The action exists only with the Divi builder active, and a logged-in user must open an attacker-controlled page; script then runs in that user's WordPress origin.
Summary
What happened
Reflected XSS in FunnelKit Funnel Builder before 3.15.0.6 allows remote attackers to execute script through a crafted Divi AJAX request. The et_wfop_optin_form action writes the request's input_size value unescaped inside a style block, allowing a closing tag to introduce script. The action exists only with the Divi builder active, and a logged-in user must open an attacker-controlled page; script then runs in that user's WordPress origin.
The record
- CVE
- CVE-2026-12978
- Published
- Jul 16, 2026
- Updated
- Jul 16, 2026
- Vendor
- FunnelKit
- Product
- FunnelKit Funnel Builder
- Classifications
- CWE-79, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2026CVE publishedPublication date reported by the CVE source.
- Jul 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.15.0.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Divi optin-form reflected XSS proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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