CVE-2025-67918 is a reflected Cross-site Scripting (XSS) vulnerability identified in the WofficeIO Woffice product, affecting versions up to and including 5.4.30. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is reflected back to users. When a victim clicks on a crafted URL or interacts with a maliciously crafted input, the injected script executes within the context of the victim's browser session. This can lead to theft of session cookies, user impersonation, or unauthorized actions performed with the victim's privileges. The CVSS v3.1 base score is 6.1, indicating a medium severity level, with an attack vector of network (remote), low attack complexity, no privileges required, but requiring user interaction. The scope is changed, meaning the vulnerability can affect resources beyond the vulnerable component. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. The vulnerability highlights a common web application security issue where input is not properly sanitized or encoded before being included in HTML output, a critical oversight in web application development. Woffice is a collaborative intranet and community WordPress theme/plugin, often used by organizations for internal communication and project management, making the vulnerability relevant for environments where sensitive information is exchanged.

For European organizations, the impact of CVE-2025-67918 can be significant, especially for those relying on Woffice for internal collaboration, document sharing, and communication. Successful exploitation can lead to the compromise of user sessions, allowing attackers to impersonate users, access sensitive information, or perform unauthorized actions within the application. This threatens confidentiality and integrity of organizational data. Although the vulnerability does not directly affect availability, the indirect effects such as loss of trust, potential data breaches, and compliance violations (e.g., GDPR) can have serious operational and reputational consequences. Organizations in sectors with high regulatory scrutiny or those handling sensitive personal or corporate data are particularly at risk. The requirement for user interaction means social engineering or phishing campaigns could be used to exploit this vulnerability, increasing the attack surface. The absence of known exploits currently provides a window for proactive mitigation before widespread exploitation occurs.

European organizations should implement several specific measures to mitigate the risk posed by CVE-2025-67918. First, monitor WofficeIO’s official channels for patches and apply updates promptly once available. Until patches are released, deploy Web Application Firewalls (WAFs) with rules designed to detect and block reflected XSS payloads targeting Woffice endpoints. Conduct thorough input validation and output encoding on all user-supplied data within the application, especially in customizations or extensions of Woffice. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Educate users about the risks of clicking on suspicious links and encourage cautious behavior to reduce the likelihood of successful social engineering. Regularly audit and review web application logs for unusual activity indicative of attempted XSS exploitation. Consider isolating or segmenting the Woffice deployment to limit the impact of a potential compromise. Finally, integrate security testing, including automated scanning for XSS vulnerabilities, into the development and deployment lifecycle of Woffice customizations.