CVE-2026-84293 in Repeater Fields for Gravity Forms Plugin
Summary
by MITRE • 09/09/2026
The Repeater Fields for Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Repeated Multi-Input Sub-Field Values in all versions up to, and including, 3.0.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability only affects multi-input sub-field types within a repeater (such as Name, Address, and Checkbox fields), as scalar single-input field values are escaped with esc_html() at the output stage in version 3.0.4.
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Analysis
by VulDB Data Team • 09/09/2026
The Repeater Fields for Gravity Forms plugin for WordPress contains a critical security flaw affecting all versions up to and including 3.0.4, characterized by insufficient input sanitization and lack of proper output escaping when handling repeated multi-input sub-field values. This vulnerability allows unauthenticated attackers to inject arbitrary web scripts into pages generated by the application, which will execute whenever an unsuspecting user accesses a page containing the injected content. The issue is specifically confined to multi-input sub-field types within repeater fields, such as Name, Address, and Checkbox fields, while scalar single-input field values are correctly escaped using esc_html at the output stage in version 3.0.4, highlighting that the flaw stems from inconsistent handling of complex input structures rather than a universal failure across all form inputs.
From a technical perspective, this vulnerability is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting or XSS. The root cause lies in the application's failure to properly sanitize user-supplied data before storing it and its subsequent failure to escape that data when rendering it back into HTML contexts within repeater field outputs. Unlike single-input fields where esc_html ensures special characters are converted to their corresponding HTML entities, multi-input sub-fields bypass this protective mechanism due to inadequate validation logic in the plugin's codebase for repeated entries. This oversight enables attackers to embed malicious JavaScript payloads directly into form submissions that persist on the server side until retrieved and displayed by other users.
The operational impact of this stored cross-site scripting vulnerability is significant because it facilitates persistent attacks without requiring user interaction beyond visiting a compromised page. Attackers can exploit this flaw to steal session cookies, hijack administrative accounts, deface websites, or redirect victims to malicious sites designed for phishing or malware distribution. Since the payload executes in the context of the victim's browser with whatever privileges that user holds on the WordPress site, high-privilege users such as administrators are particularly at risk, potentially leading to full compromise of the underlying server infrastructure if combined with other exploitation techniques. This aligns with MITRE ATT&CK technique T1059, specifically sub-technique 007 for Command and Scripting Interpretation via JavaScript in web browsers, where attackers leverage browser-side scripting capabilities to perform unauthorized actions or exfiltrate sensitive data from the authenticated session context.
To mitigate this vulnerability, administrators should immediately update the Repeater Fields plugin to version 3.0.5 or later, which addresses these sanitization and escaping deficiencies for multi-input sub-fields. In cases where updating is not immediately feasible, implementing a Web Application Firewall can help filter out malicious script injections before they reach the application logic. Additionally, enforcing strict Content Security Policy headers that restrict inline script execution provides an additional layer of defense against any residual XSS attempts. Regular security audits and code reviews focusing on input validation and output encoding practices are recommended to prevent similar issues in custom plugins or future updates, ensuring compliance with secure coding standards such as OWASP Top Ten guidelines for injection prevention.