CVE-2026-1939 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Percent to Infograph plugin for WordPress, developed by cutesalah. The vulnerability arises from improper neutralization of input during web page generation, specifically within the `percent_to_graph` shortcode. All versions up to and including 1.0 are affected due to insufficient sanitization and output escaping of user-supplied attributes. An attacker with contributor-level access or higher can inject arbitrary JavaScript code into pages by manipulating shortcode attributes. This malicious script is stored persistently and executes in the context of any user who views the infected page, potentially compromising user sessions, stealing credentials, or performing unauthorized actions. 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 above), no user interaction, and a scope change due to affecting other components beyond the vulnerable plugin. No patches or known exploits are currently available, but the risk remains significant for sites allowing contributors to add or edit content. The vulnerability is categorized under CWE-79, highlighting improper input neutralization during web page generation as the root cause.

For European organizations, this vulnerability poses a moderate risk primarily to websites using the Percent to Infograph WordPress plugin. Exploitation can lead to unauthorized script execution in users' browsers, resulting in session hijacking, data theft, defacement, or distribution of malware. Organizations relying on WordPress for content management and allowing contributor-level access to multiple users increase their exposure. The impact extends to the confidentiality and integrity of user data and site content, though availability is not directly affected. Given the widespread use of WordPress across Europe, especially in small and medium enterprises, media, and public sector websites, the vulnerability could facilitate targeted attacks or broader campaigns if weaponized. The lack of known exploits reduces immediate risk but does not eliminate the potential for future exploitation. Additionally, the scope change in CVSS indicates that the vulnerability could affect other components or users beyond the initial attacker privileges, increasing the potential damage.

European organizations should implement several specific mitigation steps: 1) Immediately audit WordPress sites for the presence of the Percent to Infograph plugin and restrict contributor-level access to trusted users only. 2) Disable or remove the plugin if it is not essential to reduce attack surface. 3) Implement web application firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the `percent_to_graph` shortcode. 4) Employ strict input validation and output encoding for all user-generated content, especially shortcodes, to prevent script injection. 5) Monitor logs and user activity for unusual behavior indicative of exploitation attempts. 6) Educate content contributors about safe content practices and the risks of injecting untrusted code. 7) Stay alert for vendor updates or patches and apply them promptly once available. 8) Consider deploying Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected sites. These measures go beyond generic advice by focusing on access control, proactive detection, and layered defenses tailored to this plugin’s vulnerability.