CVE-2025-10580 is a stored cross-site scripting (XSS) vulnerability classified under CWE-79, found 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. The vulnerability affects all versions up to 4.1.2 due to improper neutralization of input during web page generation, specifically insufficient sanitization and escaping of user-supplied data in multiple plugin functions. An attacker with authenticated access at the Contributor level or higher can inject arbitrary JavaScript payloads into widget or block content. These scripts are stored persistently and execute in the context of any user who views the compromised page, potentially allowing theft of session cookies, privilege escalation, or further site compromise. The vulnerability is remotely exploitable over the network without requiring user interaction, with a CVSS 3.1 base score of 6.4, reflecting medium severity. The scope is 'changed' because the vulnerability affects multiple users beyond the attacker. No public exploits have been reported yet, but the ease of exploitation by authenticated users makes it a significant risk for WordPress sites using this plugin. The lack of official patches at the time of disclosure necessitates immediate mitigation steps to reduce exposure.

For European organizations, this vulnerability can lead to unauthorized script execution within their WordPress sites, compromising the confidentiality and integrity of user data and site content. Attackers could hijack user sessions, deface websites, or inject malicious content that damages brand reputation and user trust. Since the vulnerability requires Contributor-level access, insider threats or compromised accounts pose a significant risk. The impact is particularly critical for organizations relying on WordPress for customer-facing portals, e-commerce, or internal communications. Exploitation could facilitate lateral movement within networks or serve as a foothold for further attacks. Given the widespread use of WordPress across Europe, especially in countries with large digital economies, the potential scale of impact is substantial. Additionally, regulatory frameworks such as GDPR impose strict data protection requirements, and exploitation could lead to compliance violations and financial penalties.

European organizations should immediately audit user roles and permissions on WordPress sites using the affected plugin, restricting Contributor-level access to trusted personnel only. Until an official patch is released, implement web application firewall (WAF) rules to detect and block suspicious input patterns targeting the plugin's vulnerable functions. Employ content security policies (CSP) to limit the execution of unauthorized scripts. Regularly monitor logs for unusual activity indicative of XSS exploitation attempts. Consider temporarily disabling or replacing the plugin with alternative solutions that do not exhibit this vulnerability. Educate site administrators and contributors on secure content practices to avoid injection of malicious code. Once a vendor patch becomes available, prioritize timely updates and verify the effectiveness of the fix through testing. Additionally, conduct periodic security assessments and vulnerability scans to detect similar issues proactively.