CVE-2025-14909 identifies a vulnerability in JeecgBoot, an open-source rapid development platform, specifically in the SysUserOnlineController class responsible for managing user sessions. The flaw exists in versions 3.0 through 3.9.0 and allows remote attackers with low privileges to manipulate active user sessions. The vulnerability arises from insufficient access control or validation in the session management functionality, enabling unauthorized session manipulation remotely without user interaction. This could allow attackers to forcibly log out users, hijack sessions, or disrupt session integrity. The vulnerability has a CVSS 4.0 score of 5.3, indicating medium severity, with an attack vector of network (remote), low attack complexity, no privileges required beyond low-level access, and no user interaction needed. Although no exploits have been observed in the wild, a public exploit is available, increasing the risk of exploitation. The issue is addressed by a patch identified as commit b686f9fbd1917edffe5922c6362c817a9361cfbd, which should be applied promptly to affected systems. The vulnerability impacts the confidentiality and integrity of user sessions and could lead to denial of service or unauthorized session control if exploited.

For European organizations, this vulnerability poses a moderate risk to the security of user sessions in applications built on JeecgBoot. Exploitation could allow attackers to manipulate or terminate active user sessions, potentially leading to unauthorized access or denial of service conditions. This could disrupt business operations, especially for services relying on continuous user sessions or sensitive session data. Organizations in sectors such as finance, healthcare, and government, where session integrity is critical, may face increased risks. The lack of requirement for user interaction or high privileges lowers the barrier for exploitation, making it a viable threat if systems remain unpatched. Additionally, the availability of a public exploit increases the likelihood of targeted attacks. However, the medium severity and absence of known active exploitation suggest that immediate widespread impact is limited but should not be underestimated.

1. Immediately apply the official patch identified by commit b686f9fbd1917edffe5922c6362c817a9361cfbd to all affected JeecgBoot instances (versions 3.0 through 3.9.0). 2. Conduct a thorough audit of session management configurations and logs to detect any anomalous session manipulations or unauthorized access attempts. 3. Implement additional access controls and monitoring around the SysUserOnlineController endpoints to restrict access to trusted administrators only. 4. Employ network-level protections such as Web Application Firewalls (WAFs) to detect and block suspicious requests targeting session management functions. 5. Educate development and operations teams on secure session management best practices to prevent similar vulnerabilities. 6. Regularly update JeecgBoot and dependent components to the latest versions to benefit from security fixes. 7. Consider implementing multi-factor authentication and session timeout policies to reduce the impact of session manipulation. 8. Monitor threat intelligence sources for any emerging exploits or attack campaigns targeting this vulnerability.