CVE-2026-30839 Wallos: SSRF via webhook test endpoint

Medium 5.3 Published 7 Mar 2026 Updated 9 Mar 2026

An attacker can exploit the webhook test endpoint to perform Server-Side Request Forgery and read internal server responses.

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-2026-30839?

CVE-2026-30839 is a medium-severity server-side request forgery vulnerability in ellite Wallos, published on 7 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 4.6.2, testwebhooknotifications.php does not validate the target URL against private/reserved IP ranges, enabling full-read SSRF. The server response is returned to the caller. This issue has been patched in version 4.6.2.

Weakness: CWE-918

Which versions are affected by CVE-2026-30839?

It affects 1 product.

Products include Wallosapp Wallos.

How do I fix CVE-2026-30839?

No fix has been published for CVE-2026-30839 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-2026-30839 being exploited?

There is no known exploitation of CVE-2026-30839 in the wild and no public exploit code.

Sources

Also known as GHSA-x4qp-xm2c-vqg9.