CVE-2026-30842 is a vulnerability classified under CWE-862 (Missing Authorization) affecting Wallos, an open-source, self-hostable personal subscription tracker. In versions prior to 4.6.2, the avatar deletion endpoint fails to verify that the authenticated user requesting deletion owns the avatar file targeted. This lack of authorization check allows any authenticated user who can identify or guess another user's avatar filename to delete that file. The vulnerability does not require user interaction beyond authentication and can be exploited remotely over the network (AV:N). The CVSS 3.1 base score is 4.3, reflecting a medium severity due to limited impact on integrity only, with no confidentiality or availability impact. The flaw compromises data integrity by allowing unauthorized deletion of user-uploaded avatar images, which could lead to user confusion or minor disruption of user profiles. The vulnerability has been addressed in Wallos version 4.6.2 by implementing proper ownership verification before allowing avatar deletion. No public exploits or widespread attacks have been reported to date. This vulnerability highlights the importance of strict authorization checks on user-specific resources in web applications.

The primary impact of this vulnerability is the unauthorized deletion of avatar files belonging to other users, which affects data integrity. While this does not compromise sensitive information confidentiality or system availability, it can degrade user experience and trust in the platform. In environments where user avatars are important for identification or personalization, such unauthorized deletions could cause confusion or minor operational disruptions. Since exploitation requires authentication, the threat is limited to users with valid accounts, reducing the risk from anonymous attackers. However, in organizations with many users or where avatars are linked to identity or reputation, this could be leveraged for targeted harassment or disruption. The absence of known exploits in the wild suggests limited active exploitation, but the vulnerability remains a risk until patched.

Organizations using Wallos versions prior to 4.6.2 should upgrade immediately to version 4.6.2 or later, where the authorization check has been implemented. If immediate upgrade is not feasible, administrators should consider restricting avatar deletion functionality to trusted users or disabling avatar uploads/deletions temporarily. Implementing additional logging and monitoring of avatar deletion requests can help detect suspicious activity. Developers should audit similar endpoints for proper authorization checks to prevent analogous vulnerabilities. Employing role-based access control (RBAC) and ensuring that resource ownership is verified before allowing modifications or deletions is critical. Regular security reviews and penetration testing focusing on authorization logic can help identify and remediate such issues proactively.