CVE-2026-107631 in Record of Consent Extension for Complianz Plugin
Summary
by MITRE • 10/15/2026
The Record of Consent Extension for Complianz plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'uid' parameter in all versions up to, and including, 2.5 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 is possible because the enforcing nonce is emitted via wp_localize_script on wp_enqueue_scripts and is therefore readable by any unauthenticated frontend visitor, and no capability or role check gates the write path.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified in Complianz for WordPress versions up to 2.5 represents a critical security flaw classified as Stored Cross-Site Scripting, commonly referred to under CWE-79. This specific instance of XSS is particularly dangerous because it allows unauthenticated attackers to inject malicious web scripts into the application's stored data rather than relying on user interaction with a crafted link alone. The root cause lies in insufficient input sanitization and output escaping within the Record of Consent Extension, specifically targeting the uid parameter. When an attacker submits this parameter without proper validation or encoding, the system stores the injected script payload directly in the database or associated storage mechanisms. Consequently, whenever any user subsequently accesses a page that renders this stored data, the malicious code executes within their browser context, potentially leading to session hijacking, credential theft, defacement, or further propagation of malware across the site's visitor base.
The technical mechanism enabling this exploitation is rooted in how WordPress handles script localization and nonce verification for frontend interactions. The vulnerability exists because the enforcing nonce required for certain operations is emitted via wp_localize_script during the wp_enqueue_scripts action hook. This function makes the nonce value readable by any unauthenticated frontend visitor, effectively neutralizing its purpose as a CSRF protection mechanism since attackers can easily retrieve valid nonces to forge requests. Furthermore, the write path associated with updating or creating consent records lacks adequate capability or role checks. In standard WordPress architecture, administrative actions should be gated by specific user roles such as administrator or editor. However, in this case, the absence of these permission gates allows any visitor, regardless of authentication status, to interact with and modify sensitive configuration data related to cookie consent records.
From an operational impact perspective, this vulnerability compromises the integrity and confidentiality of the WordPress installation. Since the attack is stored, it affects every user who views the compromised page, creating a persistent threat vector that does not require repeated exploitation attempts for each victim. Attackers can leverage this access to steal administrative credentials if cookies are accessible via JavaScript, redirect users to phishing sites, or inject additional malicious scripts such as keyloggers or crypto-mining code. The impact extends beyond individual user compromise to include potential damage to the website's reputation and compliance with data protection regulations like GDPR, given that Complianz is specifically designed to manage consent for privacy laws.
To mitigate this vulnerability, immediate action must be taken by upgrading the Complianz plugin to a version newer than 2.5 where these issues have been addressed. Developers should ensure that all user-supplied input, particularly parameters involved in database writes such as uid, undergoes rigorous sanitization using WordPress functions like sanitize_text_field or esc_sql before storage. Additionally, output escaping must be applied consistently when rendering data back to the browser context using functions like esc_html or wp_kses_post depending on the expected content type. It is also critical to enforce strict capability checks on all write operations to ensure that only authorized users with appropriate roles can modify consent records. Finally, nonce verification should not rely solely on frontend-emitted values for sensitive actions; server-side validation of user capabilities must remain the primary gatekeeper for state-changing requests.