CVE-2025-29689 is a cross-site scripting (XSS) vulnerability identified in the OA System prior to version 2025.01.01. This vulnerability arises from insufficient input validation or output encoding in the password parameter handled by the /mail/MailController.java component. An attacker can craft a malicious payload injected into this parameter, which, when processed by the vulnerable web application, results in the execution of arbitrary web scripts or HTML in the context of the victim's browser session. This type of vulnerability is classified under CWE-79, indicating a failure to properly sanitize user-supplied input, allowing script injection. The CVSS v3.1 base score is 6.1, indicating a medium severity level. The vector details (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) reveal that the attack can be launched remotely over the network without privileges, requires low attack complexity, no privileges, but does require user interaction (e.g., clicking a malicious link). The scope is changed, meaning the vulnerability affects resources beyond the initially vulnerable component. The impact affects confidentiality and integrity to a limited extent but does not impact availability. No known exploits are currently reported in the wild, and no patches or vendor advisories are linked yet. This vulnerability could be leveraged to steal session cookies, perform actions on behalf of the user, or conduct phishing attacks by injecting deceptive content into the web interface.

For European organizations using the OA System, this vulnerability poses a risk primarily to the confidentiality and integrity of user sessions and data accessed via the affected web interface. Attackers exploiting this XSS flaw could hijack user sessions, steal sensitive information, or manipulate displayed content to deceive users, potentially leading to credential theft or unauthorized actions. This is particularly concerning for organizations handling sensitive communications or internal mail systems, as the vulnerability resides in a mail controller component. The requirement for user interaction means that phishing or social engineering campaigns could be used to trigger the exploit, increasing the risk to end users. While availability is not impacted, the breach of confidentiality and integrity could lead to reputational damage, regulatory non-compliance (e.g., GDPR), and financial losses. The medium severity score reflects these risks but also the need for user interaction, which somewhat limits automated exploitation. Organizations with high reliance on the OA System for internal communications or workflow automation should prioritize addressing this vulnerability to prevent lateral movement or data leakage.

To mitigate this vulnerability effectively, European organizations should: 1) Immediately upgrade the OA System to version 2025.01.01 or later once available, as this version addresses the vulnerability. 2) In the absence of an official patch, implement web application firewall (WAF) rules to detect and block malicious payloads targeting the password parameter in /mail/MailController.java. 3) Conduct input validation and output encoding reviews on the affected parameter to ensure proper sanitization of user inputs, ideally applying context-aware encoding to prevent script injection. 4) Educate users about the risks of clicking on suspicious links or interacting with unexpected emails to reduce the likelihood of successful social engineering attacks. 5) Monitor web application logs for unusual requests or patterns indicative of XSS exploitation attempts. 6) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context, thereby reducing the impact of potential XSS payloads. 7) Perform regular security assessments and penetration testing focusing on web application input handling to proactively identify similar vulnerabilities.