CVE-2025-1303 is a reflected Cross-Site Scripting (XSS) vulnerability identified in the WordPress plugin named 'Plugin Oficial' up to version 1.7.3. The vulnerability arises because the plugin fails to properly sanitize and escape a user-controllable parameter before reflecting it back in the webpage output. This improper handling allows an attacker to inject malicious JavaScript code that executes in the context of the victim's browser. The vulnerability specifically affects unauthenticated users, meaning that attackers can exploit it without needing any credentials or prior authentication. The CVSS 3.1 base score is 6.1, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) reveals that the attack can be performed remotely over the network (AV:N), requires low attack complexity (AC:L), no privileges (PR:N), but requires user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality and integrity at a low level (C:L/I:L), but availability is not impacted (A:N). No known exploits are currently reported in the wild, and no patches are linked yet. The vulnerability is classified under CWE-79, which is the standard identifier for Cross-Site Scripting issues. This type of vulnerability can be leveraged to steal session cookies, perform actions on behalf of users, or redirect users to malicious sites, primarily targeting visitors who access pages with the vulnerable parameter. Since it affects unauthenticated users, it can be exploited broadly against any visitor to a site using the vulnerable plugin version.

For European organizations using WordPress websites with the 'Plugin Oficial' plugin version 1.7.3 or earlier, this vulnerability poses a risk of client-side attacks against their website visitors. The primary impact is on confidentiality and integrity of user data, as attackers can execute arbitrary scripts in the browsers of visitors, potentially stealing session tokens, credentials, or performing phishing attacks. While the vulnerability does not directly affect server availability or integrity, successful exploitation can damage the organization's reputation, lead to data breaches involving user information, and violate data protection regulations such as GDPR if personal data is compromised. The risk is heightened for organizations with high visitor traffic or those handling sensitive user interactions (e.g., e-commerce, membership sites). Since exploitation requires user interaction, the impact depends on the ability of attackers to lure users to crafted URLs or pages. The reflected nature of the XSS means that the attack vector is typically through malicious links, which can be distributed via email, social media, or other channels. European organizations must consider the reputational and regulatory consequences of such client-side attacks, especially given strict privacy laws and the importance of maintaining trust with users.

To mitigate this vulnerability, organizations should immediately identify if their WordPress sites use the 'Plugin Oficial' plugin version 1.7.3 or earlier. If so, they should upgrade to the latest patched version as soon as it becomes available. In the absence of an official patch, temporary mitigations include implementing a Web Application Firewall (WAF) with rules to detect and block reflected XSS payloads targeting the vulnerable parameter. Additionally, site administrators can apply input validation and output encoding at the application level if they have development resources, sanitizing all user-controllable inputs before rendering them. Employing Content Security Policy (CSP) headers can reduce the impact by restricting the execution of inline scripts and untrusted sources. Monitoring web server logs for suspicious query parameters and unusual traffic patterns can help detect attempted exploitation. Educating users about the risks of clicking on suspicious links can also reduce successful exploitation. Finally, organizations should ensure their incident response plans include procedures for handling client-side attacks and potential data breaches resulting from XSS vulnerabilities.