CVE-2025-49247 is a high-severity vulnerability classified as CWE-79, which corresponds to improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). Specifically, this vulnerability affects the 'Team Showcase' product developed by cmoreira. The vulnerability is DOM-based XSS, meaning that the malicious script is executed as a result of modifying the Document Object Model (DOM) environment in the victim's browser, rather than being directly injected into the server response. This type of XSS occurs when client-side scripts write user-controllable data to the DOM without proper sanitization or encoding, allowing attackers to execute arbitrary JavaScript in the context of the affected web application. According to the CVSS 3.1 vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), the attack can be performed remotely over the network without any privileges, requires low attack complexity, and needs user interaction (such as clicking a malicious link). The scope is changed, indicating that the vulnerability affects components beyond the initially vulnerable component, potentially impacting other parts of the system or user data. The impact on confidentiality, integrity, and availability is low to low-medium but present, as attackers can steal sensitive information, manipulate client-side data, or disrupt user sessions. No specific affected versions are listed, which suggests the vulnerability may be present in all current versions or that version details are not disclosed. No patches or known exploits in the wild have been reported yet. The vulnerability was published on July 4, 2025, and reserved on June 4, 2025. The lack of patches means organizations using Team Showcase should consider this a zero-day risk until mitigations or updates are available.

For European organizations, the impact of this DOM-based XSS vulnerability can be significant, especially for those relying on the Team Showcase product for displaying team member information or similar content on their websites. Successful exploitation could lead to session hijacking, theft of authentication tokens, redirection to malicious sites, or unauthorized actions performed on behalf of users. This can result in data breaches, reputational damage, and potential regulatory non-compliance under GDPR if personal data is compromised. The vulnerability's ability to affect confidentiality, integrity, and availability means attackers could manipulate displayed content or disrupt user interactions, undermining trust in the affected organization's web presence. Additionally, since the attack requires user interaction, phishing or social engineering campaigns could be used to lure users into triggering the exploit. European organizations with public-facing websites or intranet portals using Team Showcase are at risk, particularly those in sectors with high regulatory scrutiny such as finance, healthcare, and government. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability details are widely known.

Given the lack of available patches, European organizations should implement several specific mitigations: 1) Conduct an immediate audit of all web applications using Team Showcase to identify exposure. 2) Employ Content Security Policy (CSP) headers with strict script-src directives to limit the execution of unauthorized scripts and reduce the impact of XSS attacks. 3) Use web application firewalls (WAFs) with custom rules to detect and block suspicious input patterns that could trigger DOM-based XSS. 4) Educate users and administrators about the risks of clicking untrusted links and implement phishing awareness training. 5) Where possible, apply client-side input sanitization and encoding techniques to any user-controllable data rendered in the DOM. 6) Monitor web traffic and logs for unusual activity indicative of exploitation attempts. 7) Engage with the vendor cmoreira for updates or patches and plan for rapid deployment once available. 8) Consider temporary removal or disabling of Team Showcase components if the risk is deemed unacceptable until a fix is released.