CVE-2026-1164 is a stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, found in the Easy Voice Mail plugin for WordPress developed by phoenixstudiodz. This vulnerability affects all versions up to and including 1.2.5. The root cause is insufficient sanitization and escaping of the 'message' parameter during web page generation, which allows authenticated users with Administrator-level privileges or higher to inject arbitrary JavaScript code into pages. When other users visit these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, unauthorized actions, or the spread of malware. The vulnerability requires the attacker to have authenticated admin access, which limits exploitation to insiders or compromised accounts. The CVSS v3.1 base score is 6.1, reflecting medium severity due to network attack vector, low attack complexity, no privileges required beyond admin, and no user interaction needed for the script execution once injected. No public exploits have been reported yet, but the vulnerability poses a significant risk to sites using this plugin. The vulnerability was publicly disclosed in February 2026, with no official patches available at the time of reporting. The plugin’s widespread use in WordPress environments makes it a notable threat vector for website administrators and security teams.

The impact of CVE-2026-1164 can be significant for organizations running WordPress sites with the Easy Voice Mail plugin. Successful exploitation allows an attacker with admin privileges to inject malicious scripts that execute in the context of other users’ browsers. This can lead to theft of authentication cookies, enabling session hijacking and privilege escalation. Attackers may also perform unauthorized actions on behalf of users, deface websites, or distribute malware. Although exploitation requires admin access, compromised administrator accounts are not uncommon due to phishing or credential reuse. The vulnerability undermines the confidentiality and integrity of user data and can damage organizational reputation. For organizations relying on Easy Voice Mail for customer communications, this could disrupt business operations and erode user trust. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits post-disclosure. The vulnerability’s medium severity suggests moderate urgency but should be addressed promptly to prevent potential exploitation.

To mitigate CVE-2026-1164, organizations should first restrict administrator access to trusted personnel and enforce strong authentication mechanisms such as multi-factor authentication (MFA) to reduce the risk of account compromise. Since no official patch is currently available, administrators should consider temporarily disabling or removing the Easy Voice Mail plugin until a secure version is released. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block suspicious input patterns targeting the 'message' parameter can provide interim protection. Regularly audit and monitor logs for unusual administrator activity or unexpected script injections. Educate administrators about the risks of XSS and the importance of safeguarding credentials. Once a patch is released, promptly apply it and verify that input sanitization and output escaping are correctly implemented. Additionally, consider employing Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected sites. Conduct periodic security assessments and penetration testing focused on plugin vulnerabilities to proactively identify and remediate similar issues.