CVE-2025-68460 is an information disclosure vulnerability identified in Roundcube Webmail, a widely used open-source webmail client. The vulnerability arises from improper encoding or escaping of output within the HTML style sanitizer component, which is responsible for cleaning user-supplied HTML content to prevent malicious code execution. Specifically, versions prior to 1.5.12 and 1.6 before 1.6.12 fail to adequately sanitize style attributes in HTML emails or user inputs, leading to leakage of sensitive information. This flaw is classified under CWE-116, which involves improper encoding or escaping of output, a common vector for injection and cross-site scripting attacks. The CVSS 3.1 base score of 7.2 reflects a high severity, with an attack vector over the network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable module, impacting confidentiality (C:L) and integrity (I:L) but not availability (A:N). Although no exploits have been reported in the wild yet, the vulnerability could be exploited by remote attackers to extract sensitive information from the webmail interface, potentially including email content or user data. This poses a significant risk to organizations relying on Roundcube for email services, as attackers could leverage this flaw to gain intelligence or facilitate further attacks. The vulnerability's presence in multiple major versions increases the attack surface. The lack of available patches at the time of reporting necessitates urgent attention to upgrade once fixes are released or apply interim mitigations such as disabling HTML email rendering or restricting access to the webmail interface.

For European organizations, the impact of CVE-2025-68460 can be substantial due to the widespread use of Roundcube Webmail in public and private sectors. The vulnerability enables remote attackers to disclose sensitive information without authentication, threatening the confidentiality of email communications and user data. This can lead to exposure of personal data, internal communications, or credentials, potentially violating GDPR and other data protection regulations. The integrity impact, while lower, could allow attackers to manipulate displayed content or facilitate phishing attacks by injecting malicious styles. The absence of availability impact means services remain operational, but the trustworthiness of the email platform is compromised. Sectors such as government, finance, healthcare, and critical infrastructure in Europe, which rely heavily on secure email communications, are particularly vulnerable. The vulnerability could also be leveraged as a foothold for more advanced attacks, including lateral movement or espionage. The cross-border nature of email communications in Europe amplifies the risk of data leakage across jurisdictions. Organizations failing to patch promptly may face regulatory penalties, reputational damage, and operational disruptions.

To mitigate CVE-2025-68460, European organizations should immediately plan to upgrade Roundcube Webmail to versions 1.5.12 or 1.6.12 once patches are available. Until then, organizations can reduce risk by disabling HTML email rendering or restricting the use of style attributes in emails through configuration settings. Implement strict access controls to the webmail interface, limiting it to trusted networks or VPN users. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious HTML content or style attribute manipulations. Conduct thorough audits of email sanitization configurations and monitor logs for unusual access patterns or errors related to HTML processing. Educate users about the risks of opening HTML emails from untrusted sources. Regularly update and patch all related components, including underlying web servers and PHP versions, to minimize attack surface. Additionally, implement data loss prevention (DLP) tools to detect potential information leakage. Coordinate with incident response teams to prepare for potential exploitation attempts and establish monitoring for indicators of compromise related to webmail usage.