CVE-2026-77792 in RegistrationMagic Plugin
Summary
by MITRE • 09/02/2026
The RegistrationMagic WordPress plugin before 6.0.9.9 does not escape a registration form field value before outputting it in an HTML attribute on an administrative page, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against high privilege users such as admin.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified in the RegistrationMagic WordPress plugin prior to version 6.0.9.9 represents a critical security flaw rooted in improper input validation and output encoding mechanisms. Specifically, the application fails to properly sanitize or escape user-supplied data from registration form fields before rendering it within HTML attributes on administrative pages. This oversight creates a direct pathway for Stored Cross-Site Scripting attacks, where malicious scripts are permanently stored on the target server via the vulnerable field and subsequently executed when an administrator views the affected page. The core technical failure lies in the absence of context-aware output encoding, which is essential to prevent browser interpretation of injected code as executable script rather than plain text data.
From a technical perspective, this flaw aligns with CWE-79, commonly known as Improper Neutralization of Input During Web Page Generation or Cross-site Scripting. The vulnerability allows unauthenticated attackers to inject arbitrary JavaScript payloads into the registration form submissions. Because these values are stored in the database and later retrieved for display on administrative interfaces without adequate sanitization, the malicious code persists across sessions. When a high-privilege user, such as a WordPress administrator, accesses the page containing this data, their browser executes the injected script within the context of the admin dashboard. This execution occurs under the security privileges of the logged-in administrator, granting the attacker significant leverage over the application environment.
The operational impact of this vulnerability is severe due to the privilege level required for exploitation and the persistence of the attack vector. Since the payload is stored server-side, a single successful injection can compromise multiple administrators who view the affected page, leading to widespread credential theft or session hijacking if combined with other techniques like cookie stealing via document.cookie access. Attackers can also perform actions on behalf of the administrator, such as creating new admin accounts, modifying site settings, installing malicious plugins, or defacing the website content. This effectively results in a complete compromise of the WordPress installation's integrity and confidentiality, potentially exposing sensitive user data stored within the CMS to external parties.
In terms of threat modeling, this vulnerability maps directly to MITRE ATT&CK technique T1059.007, which covers JavaScript execution on web browsers as part of Command and Control or Initial Access phases depending on the attacker's goal. The unauthenticated nature of the initial vector means that no prior access is required to plant the payload, lowering the barrier for entry significantly. Once executed, the script can facilitate further lateral movement within the network if the compromised admin account has broader system access beyond just the web application layer.
Mitigation strategies must focus on immediate remediation and long-term defensive coding practices. The primary solution is to upgrade the RegistrationMagic plugin to version 6.0.9.9 or later, where this specific input handling flaw has been addressed by developers through proper escaping functions such as esc_attr in WordPress development standards. For organizations unable to update immediately due to compatibility concerns, temporary workarounds include implementing a Web Application Firewall rule that detects and blocks common XSS payload patterns in registration form submissions. Additionally, enforcing strict Content Security Policy headers can help mitigate the impact of any successful injection by restricting script execution sources. Regular security audits and code reviews focusing on input validation and output encoding are essential to prevent similar vulnerabilities from being introduced into WordPress plugins or custom themes in the future.