CVE-2026-1911 is a stored cross-site scripting (XSS) vulnerability identified in the Twitter Feeds plugin for WordPress developed by viaviwebtech. This vulnerability exists in all versions up to and including 1.0.0 due to improper neutralization of input during web page generation, specifically via the 'tweet_title' parameter in the 'TwitterFeeds' shortcode. The root cause is insufficient input sanitization and output escaping, which allows an authenticated attacker with Contributor-level privileges or higher to inject arbitrary JavaScript code into pages rendered by the plugin. Because the injected scripts are stored persistently, they execute every time a user accesses the affected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of users. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting medium severity, with an attack vector of network, low attack complexity, requiring privileges (Contributor or higher), no user interaction, and a scope change. Although no known exploits have been reported in the wild, the vulnerability poses a significant risk to WordPress sites using this plugin, especially those with multiple users or contributors. The lack of available patches at the time of publication necessitates immediate attention to input validation and output encoding best practices to mitigate risk.

The impact of CVE-2026-1911 can be significant for organizations running WordPress sites with the vulnerable Twitter Feeds plugin. Successful exploitation allows attackers with Contributor-level access to inject malicious scripts that execute in the context of other users visiting the affected pages. This can lead to session hijacking, theft of sensitive information such as cookies or credentials, unauthorized actions performed on behalf of users, and potential defacement or redirection attacks. Since the vulnerability requires authenticated access, insider threats or compromised contributor accounts are primary vectors. The scope change in the CVSS vector indicates that the vulnerability can affect resources beyond the initially compromised component, potentially impacting site integrity and user trust. Organizations with multi-user WordPress environments, especially those allowing external contributors, face higher risk. The absence of known exploits currently reduces immediate threat but does not eliminate the risk of future attacks. Overall, the vulnerability undermines confidentiality and integrity but does not affect availability.

To mitigate CVE-2026-1911, organizations should first check for and apply any official patches or updates from viaviwebtech once released. In the absence of patches, immediate steps include disabling or removing the Twitter Feeds plugin to eliminate exposure. Implement strict input validation on the 'tweet_title' parameter, ensuring that all user-supplied data is sanitized to remove or encode potentially dangerous characters before storage. Employ robust output encoding techniques when rendering the shortcode content to prevent script execution. Limit Contributor-level access strictly to trusted users and audit existing contributor accounts for suspicious activity. Use Web Application Firewalls (WAFs) with custom rules to detect and block attempts to inject malicious scripts via the vulnerable parameter. Regularly monitor logs and user activity for signs of exploitation. Educate site administrators and contributors about the risks of XSS and safe content practices. Finally, consider employing Content Security Policy (CSP) headers to restrict script execution sources, reducing the impact of any injected scripts.