The vulnerability identified as CVE-2025-63693 affects the comment editing template file (dzz/comment/template/edit_form.htm) in DzzOffice version 2.3.x. The root cause is inadequate escaping of user-controllable input in multiple contexts, including HTML and JavaScript strings. This improper sanitization allows attackers with low privileges to craft malicious comment content or manipulate request parameters to inject arbitrary JavaScript code. When a victim user opens the editing pop-up for comments, the injected script executes in their browser context, leading to a cross-site scripting (XSS) attack. The vulnerability is classified under CWE-94 (Improper Control of Generation of Code), indicating that user input is improperly handled in code generation contexts. The CVSS v3.1 base score is 5.4 (medium), reflecting network attack vector, low attack complexity, low privileges required, user interaction needed, and a scope change. The impact affects confidentiality and integrity partially but does not affect availability. No official patches or exploit code are currently available, and no known exploits are reported in the wild. The vulnerability was published on November 18, 2025, with a reserved date of October 27, 2025. The lack of adequate escaping in multiple contexts increases the risk of successful exploitation, especially in environments where users frequently interact with comment editing features.

For European organizations, exploitation of CVE-2025-63693 could lead to unauthorized script execution within user sessions, enabling theft of session tokens, user impersonation, or manipulation of displayed content. This compromises confidentiality and integrity of user data and may facilitate further attacks such as privilege escalation or lateral movement within the application. Organizations relying on DzzOffice 2.3.x for collaboration or document management risk exposure of sensitive internal communications. The requirement for user interaction limits automated exploitation but targeted phishing or social engineering could trigger the vulnerability. The medium severity score suggests moderate risk, but impact could be significant in sectors handling sensitive or regulated data, such as finance, healthcare, or government. Additionally, the scope change in CVSS indicates that the vulnerability affects components beyond the initially targeted system, potentially impacting integrated services or user workflows. Lack of known exploits reduces immediate risk but should not delay mitigation given the potential for future weaponization.

To mitigate CVE-2025-63693, organizations should first verify if they are using DzzOffice version 2.3.x and restrict access to the comment editing functionality to trusted users only. Since no official patches are currently available, implement input validation and output encoding on all user-controllable data within the comment editing template, ensuring proper escaping for HTML and JavaScript contexts. Employ Content Security Policy (CSP) headers to restrict execution of unauthorized scripts and reduce XSS impact. Educate users to be cautious when opening comment editing pop-ups, especially from untrusted sources. Monitor web application logs for suspicious activity related to comment editing requests. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block malicious payloads targeting this vulnerability. Engage with the DzzOffice vendor or community for updates on patches or security advisories. Finally, conduct regular security assessments and penetration tests focusing on user input handling in web application components.