CVE-2025-10580 is a stored cross-site scripting vulnerability identified in the WordPress plugin 'Widget Options – Advanced Conditional Visibility for Gutenberg Blocks & Classic Widgets' developed by marketingfire. This plugin is widely used to control widget and block visibility on WordPress sites, supporting both Gutenberg blocks and classic widgets. The vulnerability exists in all plugin versions up to and including 4.1.2 due to insufficient sanitization of user input and inadequate output escaping in multiple plugin functions. Authenticated users with Contributor-level privileges or higher can exploit this flaw by injecting arbitrary JavaScript code into widget or block content. Because the malicious script is stored persistently, it executes whenever any user accesses the affected page, potentially leading to session hijacking, privilege escalation, or unauthorized actions performed on behalf of the victim. The vulnerability does not require user interaction beyond page access, and the attack vector is network-based. The CVSS 3.1 base score is 6.4, indicating medium severity, with the vector string AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. This means the attack can be launched remotely over the network with low complexity, requires privileges (Contributor or higher), no user interaction, and impacts confidentiality and integrity with a scope change. No public exploits or patches are currently available, increasing the urgency for organizations to implement mitigations or monitor for suspicious activity. Given the plugin's popularity, this vulnerability could be leveraged in targeted attacks against WordPress sites, especially those with multiple contributors.

For European organizations, the impact of this vulnerability can be significant, particularly for those relying on WordPress for their web presence and using the affected plugin. Successful exploitation can lead to the injection of malicious scripts that compromise user sessions, steal sensitive data, or manipulate site content, undermining trust and potentially causing reputational damage. Confidentiality is impacted as attackers may access or exfiltrate user information. Integrity is compromised as attackers can alter site content or perform unauthorized actions. Availability is not directly affected, but indirect impacts such as site defacement or administrative lockout could occur. Organizations with multiple contributors or editors are at higher risk since the vulnerability requires authenticated access with at least Contributor privileges. This could facilitate insider threats or exploitation of compromised contributor accounts. The vulnerability also poses compliance risks under GDPR if personal data is exposed or manipulated. Given the widespread use of WordPress in Europe, especially among SMEs and public sector entities, the threat is relevant across multiple sectors.

1. Immediate mitigation involves restricting Contributor-level access and above to trusted users only, minimizing the risk of malicious input injection. 2. Implement web application firewalls (WAFs) with rules to detect and block common XSS payloads targeting the affected plugin. 3. Monitor logs and user activity for unusual behavior indicative of exploitation attempts, such as unexpected script injections or content changes. 4. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected sites. 5. Regularly update the plugin once a security patch is released by the vendor; until then, consider disabling the plugin if feasible or replacing it with alternative solutions. 6. Conduct security awareness training for contributors to recognize phishing or social engineering attempts that could lead to account compromise. 7. Use multi-factor authentication (MFA) for all WordPress user accounts to reduce the risk of credential abuse. 8. Perform code reviews and security testing on custom widgets or blocks that interact with the plugin to identify additional vulnerabilities.