Wallos SSRF and XSS Vulnerabilities

An incomplete Server-Side Request Forgery (SSRF) mitigation in Wallos, a self-hostable subscription tracker, allows authenticated attackers to bypass security controls and force the application to make requests to internal or private IP addresses. Wallos versions prior to 4.7.0 are affected. The vulnerability occurs because SSRF validation was added to test notification endpoints but not the corresponding save endpoints, enabling attackers to store malicious URLs that execute without validation when the cron job runs. No active exploitation (KEV) or public POC is currently documented.

Wallos, an open-source self-hostable subscription tracker, contains a Server-Side Request Forgery (SSRF) vulnerability in versions prior to 4.7.0 that allows authenticated users to access internal network services, cloud metadata endpoints, and localhost-bound services. The vulnerability exists in three unprotected attack surfaces: the AI Ollama host parameter, the AI recommendations endpoint, and the notification cron job-areas that were missed when SSRF protections were partially implemented in an earlier patch (CVE-2026-30840). An attacker with valid credentials can leverage these endpoints to reach sensitive internal resources including AWS IMDSv1, GCP, and Azure metadata services.