CVE-2025-58623 is a Cross-site Scripting (XSS) vulnerability classified under CWE-79, specifically a DOM-based XSS, found in the Bohemia Plugins Event Feed for Eventbrite. This plugin integrates Eventbrite event feeds into websites, allowing dynamic display of event information. The vulnerability arises due to improper neutralization of input during web page generation, meaning that user-supplied data is not correctly sanitized or encoded before being processed and rendered in the Document Object Model (DOM). As a result, an attacker can inject malicious scripts that execute in the context of the victim's browser when they visit a page using the affected plugin version (up to 1.3.2). The CVSS v3.1 base score is 6.5 (medium severity), with vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L, indicating that the attack can be performed remotely over the network with low attack complexity, requires low privileges and user interaction, and impacts confidentiality, integrity, and availability to a limited extent. The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component. Although no known exploits are reported in the wild yet, the vulnerability poses a risk of session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The lack of available patches means organizations must rely on mitigation strategies until an official fix is released.

For European organizations, this vulnerability can lead to significant security risks, especially for those using the Bohemia Plugins Event Feed for Eventbrite on their websites. Exploitation could allow attackers to execute arbitrary JavaScript in users' browsers, potentially stealing session cookies, redirecting users to malicious sites, or performing unauthorized actions on behalf of users. This can damage organizational reputation, lead to data breaches involving personal or financial information, and violate data protection regulations such as the GDPR. Since Eventbrite is widely used for event management across Europe, organizations hosting public-facing event pages are at risk. The vulnerability could also be leveraged in targeted phishing campaigns or supply chain attacks, amplifying its impact. Additionally, the cross-site scripting could be used to bypass security controls or deliver further malware payloads, increasing the threat landscape for affected entities.

Until an official patch is released, European organizations should implement several specific mitigations: 1) Disable or remove the Bohemia Plugins Event Feed for Eventbrite plugin from websites if feasible, especially on high-risk or sensitive sites. 2) Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit sources of executable code, reducing the impact of injected scripts. 3) Use web application firewalls (WAFs) with rules tailored to detect and block suspicious payloads targeting the plugin's input vectors. 4) Conduct thorough input validation and output encoding on any data passed to or from the plugin if customization is possible. 5) Educate web administrators and developers about the risks of DOM-based XSS and monitor web logs for unusual activity. 6) Monitor vendor communications closely for patch releases and apply updates promptly. 7) Consider isolating the plugin functionality in sandboxed iframes or separate subdomains to limit script execution scope. These measures go beyond generic advice by focusing on immediate risk reduction and containment strategies specific to the plugin's context.