CVE-2024-11809 identifies a reflected Cross-Site Scripting (XSS) vulnerability in the Primer MyData for Woocommerce plugin for WordPress, present in all versions up to and including 4.2.1. The vulnerability stems from improper neutralization of user input in the 'img_src' parameter, which is insufficiently sanitized and escaped before being included in web pages. This allows an unauthenticated attacker to craft a malicious URL containing a payload in the 'img_src' parameter. When a victim clicks this URL, the injected script executes in their browser context, potentially enabling theft of cookies, session tokens, or other sensitive information, and performing actions on behalf of the user. The vulnerability is classified under CWE-79, indicating a failure to properly sanitize input during web page generation. The CVSS 3.1 base score is 6.1, with vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, meaning the attack is remotely exploitable over the network with low attack complexity, requires no privileges but does require user interaction, and impacts confidentiality and integrity with a scope change. No patches or fixes are currently linked, and no known exploits have been reported in the wild as of the publication date. The vulnerability affects a widely used e-commerce plugin, increasing the risk to online stores using WordPress and WooCommerce. Attackers could leverage this vulnerability to conduct phishing, session hijacking, or defacement attacks, undermining customer trust and data security.

The primary impact of CVE-2024-11809 is on the confidentiality and integrity of user data within affected WordPress sites using the Primer MyData for Woocommerce plugin. Successful exploitation allows attackers to execute arbitrary scripts in the context of the victim's browser, potentially leading to theft of session cookies, credentials, or personal information. This can facilitate account takeover, unauthorized transactions, or further attacks such as malware distribution. Although availability is not directly affected, the reputational damage and loss of customer trust can have significant business consequences. E-commerce sites are particularly vulnerable as they handle sensitive payment and user data. The requirement for user interaction (clicking a malicious link) somewhat limits exploitation but does not eliminate risk, especially in phishing-prone environments. The vulnerability's network accessibility and lack of required privileges increase its attractiveness to attackers. Organizations worldwide using this plugin face risks of data breaches, fraud, and regulatory non-compliance if unmitigated.

1. Immediate mitigation involves updating the Primer MyData for Woocommerce plugin to a patched version once available from the vendor. Monitor official channels for patch releases. 2. In the absence of a patch, implement Web Application Firewall (WAF) rules to detect and block malicious payloads targeting the 'img_src' parameter, focusing on script tags and suspicious input patterns. 3. Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit sources of executable scripts, reducing the impact of XSS. 4. Educate users and staff about phishing risks to reduce the likelihood of clicking malicious links. 5. Review and harden input validation and output encoding practices in custom code interacting with the plugin, if applicable. 6. Regularly audit logs for suspicious requests containing unusual 'img_src' parameter values. 7. Consider disabling or restricting the plugin functionality temporarily if the risk is critical and no patch is available. 8. Use security plugins that provide XSS protection and monitor for anomalous behavior on the WordPress site.