CVE-2026-1905 is a stored Cross-Site Scripting (XSS) vulnerability identified in the Sphere Manager plugin for WordPress, specifically affecting all versions up to and including 1.0.2. The vulnerability stems from improper neutralization of input during web page generation, classified under CWE-79. It occurs due to insufficient sanitization and escaping of the 'width' parameter within the 'show_sphere_image' shortcode, allowing an authenticated attacker with Contributor-level access or higher to inject arbitrary JavaScript code. This malicious code is stored persistently and executed in the context of any user who views the infected page, potentially leading to session hijacking, privilege escalation, or unauthorized actions performed on behalf of the victim. The CVSS 3.1 base score is 6.4, reflecting a medium severity with a network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), and a scope change (S:C) indicating that the vulnerability affects resources beyond the initially vulnerable component. The impact affects confidentiality and integrity but not availability. No public exploits have been reported yet, but the vulnerability's nature and ease of exploitation by authenticated users make it a significant risk for WordPress sites using this plugin. The lack of available patches at the time of publication necessitates immediate mitigation efforts.

For European organizations, the exploitation of CVE-2026-1905 could lead to unauthorized script execution within their WordPress sites, compromising user session tokens, stealing sensitive information, or performing unauthorized actions under the guise of legitimate users. This is particularly concerning for organizations relying on WordPress for customer-facing websites, intranets, or portals where Contributor-level users are present. The vulnerability could facilitate lateral movement within an organization’s web infrastructure or be leveraged as a foothold for further attacks. Given the scope change in the CVSS vector, the impact extends beyond the plugin itself, potentially affecting other components or user data managed by the WordPress instance. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits rapidly once vulnerabilities are publicized. European organizations with strict data protection regulations (e.g., GDPR) may face compliance risks if user data confidentiality is compromised.

1. Immediate mitigation involves restricting Contributor-level and higher user permissions to trusted personnel only, minimizing the risk of malicious input injection. 2. Disable or remove the Sphere Manager plugin if it is not essential to reduce the attack surface. 3. Implement Web Application Firewall (WAF) rules to detect and block suspicious payloads targeting the 'width' parameter in the 'show_sphere_image' shortcode. 4. Monitor logs for unusual activity or unexpected script injections related to this plugin. 5. Encourage the vendor to release a patch and apply it promptly once available. 6. Conduct a thorough audit of all pages using the shortcode to identify and sanitize any injected malicious scripts. 7. Educate content contributors about secure input practices and the risks of XSS vulnerabilities. 8. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected sites.