CVE-2026-33401

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, the patch introduced in commit e8a513591 (CVE-2026-30840) added SSRF protection to notification test endpoints but left three additional attack surfaces unprotected: the AI Ollama host parameter, the AI recommendations endpoint, and the notification cron job. An authenticated user can reach internal network services, cloud metadata endpoints (AWS IMDSv1, GCP, Azure IMDS), or localhost-bound services by supplying a crafted URL to any of these endpoints. This issue has been patched in version 4.7.0.

Authenticated attacker logs into a cloud-hosted Wallos instance. In the AI settings, they set the Ollama host parameter to http://169.254.169.254/latest/meta-data/iam/security-credentials/. The Wallos application makes an outbound request to this URL and returns the response — including temporary AWS IAM credentials with the instance role permissions. Attacker extracts AccessKeyId, SecretAccessKey, and Token, then uses them via AWS CLI to enumerate S3 buckets, read secrets from Secrets Manager, or pivot to other AWS services. The notification cron job endpoint provides an alternative trigger that fires automatically, removing the need for repeated manual interaction.