CVE-2025-2799 is a medium-severity stored Cross-Site Scripting (XSS) vulnerability affecting the WP Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce plugin for WordPress. This vulnerability arises from improper neutralization of input during web page generation, specifically involving the 'tag-name' parameter. Versions up to and including 3.1.49 are affected. The root cause is insufficient input sanitization and output escaping, which allows an authenticated attacker with administrator-level privileges to inject arbitrary JavaScript code into pages. These malicious scripts execute whenever any user accesses the compromised page. Notably, this vulnerability only impacts multi-site WordPress installations or installations where the 'unfiltered_html' capability has been disabled, limiting the scope somewhat. The CVSS 3.1 base score is 4.4, reflecting a medium severity level, with the vector indicating network attack vector, high attack complexity, high privileges required, no user interaction needed, and a scope change. The vulnerability impacts confidentiality and integrity but not availability. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in March 2025 and published in July 2025. The CWE classification is CWE-79, which covers improper neutralization of input leading to XSS. This vulnerability could be leveraged by malicious administrators to execute scripts that steal session tokens, perform actions on behalf of other users, or deface websites, potentially undermining trust and data confidentiality within affected WordPress sites.

For European organizations using WordPress with the WP Event Manager plugin, this vulnerability poses a risk primarily to multi-site installations or those with restricted HTML filtering. Exploitation could lead to unauthorized script execution, enabling attackers to hijack user sessions, steal sensitive data, or manipulate site content. This is particularly concerning for organizations managing event registrations and ticket sales, where customer data and payment information may be involved. The impact on confidentiality and integrity could result in data breaches or fraudulent transactions, damaging organizational reputation and violating data protection regulations such as GDPR. Although availability is not directly impacted, the indirect effects of trust erosion and potential regulatory penalties could be significant. Since exploitation requires administrator-level access, the threat is somewhat mitigated by internal access controls; however, insider threats or compromised administrator accounts remain a concern. The lack of known exploits in the wild suggests limited immediate risk, but the presence of this vulnerability in a widely used plugin means European organizations should prioritize mitigation to prevent future attacks.

European organizations should take the following specific steps to mitigate this vulnerability: 1) Immediately audit WordPress installations to identify multi-site setups or those with 'unfiltered_html' disabled using the WP Event Manager plugin. 2) Restrict administrator access strictly to trusted personnel and enforce strong authentication mechanisms, including multi-factor authentication, to reduce the risk of credential compromise. 3) Monitor and review all inputs related to the 'tag-name' parameter and other user-generated content for suspicious scripts or anomalies. 4) Implement Web Application Firewall (WAF) rules tailored to detect and block XSS payloads targeting this plugin’s parameters. 5) Regularly update the WP Event Manager plugin as soon as the vendor releases a patch addressing CVE-2025-2799. 6) Educate administrators about the risks of XSS and safe content management practices. 7) Consider deploying Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. 8) Conduct periodic security assessments and penetration tests focusing on WordPress plugins and multi-site configurations to detect similar vulnerabilities proactively.