CVE-2025-64365 identifies a DOM-based Cross-site Scripting (XSS) vulnerability in the colabrio Ohio Extra product, affecting all versions up to and including 3.6.0. This vulnerability stems from improper neutralization of user input during the generation of web pages, which allows malicious scripts to be injected and executed in the context of the victim's browser. Unlike reflected or stored XSS, DOM-based XSS occurs entirely on the client side, manipulating the Document Object Model without server-side script injection. The vulnerability requires an attacker to have low-level privileges (PR:L) but does not require user interaction (UI:N), meaning exploitation can be automated or triggered without victim action. The CVSS vector indicates network attack vector (AV:N), low attack complexity (AC:L), and no impact on integrity or availability, but a high impact on confidentiality (C:H). This suggests that an attacker could exfiltrate sensitive information accessible in the victim’s browser session, such as authentication tokens or personal data, but cannot modify data or disrupt service. No known exploits are currently reported in the wild, but the vulnerability is publicly disclosed and should be considered a risk for affected deployments. The lack of available patches at the time of disclosure necessitates immediate attention to mitigation strategies. The vulnerability is particularly relevant for organizations relying on Ohio Extra for web-based collaboration or data management, as exploitation could compromise user data confidentiality.

For European organizations, the primary impact of CVE-2025-64365 is the potential unauthorized disclosure of sensitive information through exploitation of the DOM-based XSS vulnerability. This can lead to data breaches involving personal data, intellectual property, or session tokens, undermining user privacy and trust. Sectors such as finance, healthcare, and government, which often use collaboration tools like Ohio Extra, are at higher risk due to the sensitivity of their data. The vulnerability does not affect data integrity or system availability, so operational disruption is unlikely. However, the confidentiality breach could trigger regulatory consequences under GDPR, including fines and reputational damage. Since exploitation requires low privileges but no user interaction, attackers could automate attacks against exposed installations, increasing the risk of widespread data leakage. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as threat actors may develop exploits following public disclosure. Organizations with remote or web-accessible deployments of Ohio Extra are particularly vulnerable to external attacks.

1. Monitor vendor communications closely and apply official patches or updates for Ohio Extra as soon as they become available. 2. Implement strict input validation and sanitization on all user-controllable inputs within the application to prevent malicious script injection. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of untrusted scripts and reduce the impact of potential XSS attacks. 4. Conduct regular security assessments and penetration testing focused on client-side vulnerabilities, including DOM-based XSS. 5. Limit user privileges to the minimum necessary to reduce the attack surface, as exploitation requires low privileges. 6. Educate users and administrators about the risks of XSS and encourage vigilance for suspicious activity. 7. Use web application firewalls (WAFs) with rules tuned to detect and block XSS attack patterns targeting Ohio Extra. 8. Review and harden browser security settings and consider implementing browser isolation techniques for sensitive environments. 9. Log and monitor web application traffic for unusual patterns that may indicate exploitation attempts. 10. Prepare incident response plans specific to web application attacks to enable rapid containment if exploitation occurs.