CVE-2025-1289 is a medium-severity vulnerability classified as CWE-79 (Cross-Site Scripting, XSS) affecting the WordPress plugin named "Plugin Oficial" up to version 1.7.3. The vulnerability arises because the plugin fails to properly sanitize and escape certain settings inputs. This flaw allows users with high privileges, such as administrators, to inject and store malicious scripts (Stored XSS) within the plugin's settings. Notably, this exploitation is possible even when the WordPress capability 'unfiltered_html' is disabled, which is a common restriction in multisite WordPress environments to prevent script injection by users. The attack requires high privilege (admin) and user interaction (such as visiting a crafted page or admin panel), but the vulnerability can lead to a scope change (S:C) affecting multiple users or sites within the multisite setup. The CVSS v3.1 base score is 4.8, reflecting a medium severity due to the limited confidentiality and integrity impact and no direct availability impact. The vulnerability could allow an attacker to execute arbitrary JavaScript in the context of other administrators or users, potentially leading to session hijacking, privilege escalation, or further attacks within the WordPress environment. There are no known exploits in the wild currently, and no official patches have been linked yet. The vulnerability was reserved in February 2025 and published in May 2025, with WPScan as the assigner. The attack vector is network-based (remote), with low attack complexity, but requires high privileges and user interaction, which limits the ease of exploitation to some extent.

For European organizations using WordPress multisite installations with the Plugin Oficial plugin, this vulnerability poses a risk primarily to the integrity and confidentiality of their web environments. An attacker with admin privileges could inject malicious scripts that execute in other administrators' browsers, potentially stealing session cookies, modifying site content, or injecting further malicious payloads. This could lead to unauthorized access, defacement, or data leakage. Given the multisite context, the impact could extend across multiple sites managed under a single WordPress instance, amplifying the damage. Organizations in sectors with strict data protection regulations, such as finance, healthcare, or government, could face compliance risks if sensitive data is exposed or manipulated. Although the vulnerability does not directly affect availability, the indirect consequences of compromised admin accounts could disrupt operations. The medium CVSS score reflects that exploitation requires high privileges and user interaction, somewhat limiting the threat surface. However, insider threats or compromised admin accounts could leverage this vulnerability effectively. The lack of known exploits in the wild suggests limited immediate risk but does not preclude future exploitation. European organizations should be vigilant, especially those with large WordPress multisite deployments and critical web assets.

1. Immediate mitigation should include auditing and restricting admin privileges to trusted personnel only, minimizing the risk of malicious or accidental exploitation. 2. Implement strict input validation and output escaping in the Plugin Oficial plugin settings as a custom patch or temporary fix if official updates are not yet available. 3. Monitor WordPress multisite environments for unusual admin activity or unexpected script injections. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the WordPress admin interface. 5. Regularly update the Plugin Oficial plugin once the vendor releases a patch addressing this vulnerability. 6. Use Web Application Firewalls (WAF) with rules targeting common XSS payloads to provide an additional layer of defense. 7. Educate administrators on the risks of stored XSS and encourage cautious behavior when interacting with plugin settings or unknown inputs. 8. Consider isolating critical multisite environments or limiting plugin usage to reduce attack surface. These recommendations go beyond generic advice by focusing on privilege management, custom patching, monitoring, and layered defenses specific to multisite WordPress setups.