CVE-2026-33399 Wallos: SSRF Bypass - Incomplete Fix for CVE-2026-30839/30840

High 7.7 Published 24 Mar 2026 Updated 24 Mar 2026

Authenticated users can bypass SSRF protections in Wallos by saving internal IPs in notification settings, leading to internal network access via cron jobs.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-33399?

CVE-2026-33399 is a high-severity server-side request forgery vulnerability in ellite Wallos, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, the SSRF fix applied in version 4.6.2 for CVE-2026-30839 and CVE-2026-30840 is incomplete. The validate_webhook_url_for_ssrf() protection was added to the test* notification endpoints but not to the corresponding save* endpoints. An authenticated user can save an internal/private IP address as a notification URL, and when the cron job sendnotifications.php executes, the request is sent to the internal IP without any SSRF validation. This issue has been patched in version 4.7.0.

Weakness: CWE-918

Which versions are affected by CVE-2026-33399?

It affects 1 product.

Products include Wallosapp Wallos.

How do I fix CVE-2026-33399?

No fix has been published for CVE-2026-33399 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-33399 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33399 exists.

Sources

Also known as GHSA-mfjc-3258-cq3j.