CVE-2012-6692 in SEO by Yoast Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in js/wp-seo-metabox.js in the WordPress SEO by Yoast plugin before 2.2 for WordPress allows remote attackers to inject arbitrary web script or HTML via the post_title parameter to wp-admin/post-new.php, which is not properly handled in the snippet preview functionality.
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Analysis
by VulDB Data Team • 05/21/2022
The CVE-2012-6692 vulnerability represents a critical cross-site scripting flaw in the WordPress SEO by Yoast plugin, specifically affecting versions prior to 2.2. This vulnerability resides within the js/wp-seo-metabox.js javascript file and demonstrates a classic input validation failure that enables remote code execution through malicious web scripts. The issue manifests when the post_title parameter is manipulated in the wp-admin/post-new.php endpoint, where the snippet preview functionality fails to properly sanitize user input before rendering it in the browser context.
The technical exploitation of this vulnerability occurs through the manipulation of the post_title parameter, which is processed by the plugin's snippet preview system. When an attacker crafts a malicious payload and submits it through the post creation interface, the javascript code responsible for generating the snippet preview fails to implement proper output encoding or sanitization. This allows the malicious script to execute within the context of a victim's browser session, potentially enabling session hijacking, credential theft, or redirection to malicious sites. The vulnerability is classified as a reflected XSS attack pattern where user-supplied data flows directly into the browser without adequate sanitization.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with a foothold for more sophisticated attacks within WordPress administrative environments. Since the vulnerability affects the core WordPress admin interface, successful exploitation could lead to unauthorized content manipulation, privilege escalation, or complete administrative compromise. The attack vector is particularly concerning because it requires minimal user interaction beyond navigating to the affected page, making it susceptible to automated exploitation. This vulnerability aligns with CWE-79, which specifically addresses Cross-site Scripting flaws in web applications, and represents a common attack pattern documented in the MITRE ATT&CK framework under the technique of Web Application Attack.
Mitigation strategies for CVE-2012-6692 should prioritize immediate plugin updates to version 2.2 or later, which contain the necessary sanitization fixes. Organizations should also implement additional security measures including input validation at multiple layers, output encoding for all dynamic content, and regular security audits of third-party plugins. Network-based protections such as web application firewalls can provide additional defense-in-depth, though the most effective solution remains the timely application of vendor security patches. Security monitoring should focus on detecting unusual patterns in admin interface usage and unauthorized content modifications, as these activities may indicate exploitation attempts. The vulnerability underscores the critical importance of maintaining up-to-date security practices and demonstrates how seemingly minor input validation gaps can create significant security risks in content management systems.