CVE-2026-33407 Wallos: SSRF via HTTP Proxy Environment Variable

High 8.3 Published 24 Mar 2026 Updated 26 Mar 2026

Attackers can trigger server-side requests to arbitrary domains via proxy environment variables in Wallos, potentially accessing internal resources.

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

What is CVE-2026-33407?

CVE-2026-33407 is a high-severity server-side request forgery vulnerability in ellite Wallos, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, Wallos endpoints/logos/search.php accepts HTTP_PROXY and HTTPS_PROXY environment variables without validation, enabling SSRF via proxy hijacking. The server performs DNS resolution on user-supplied search terms, which can be controlled by attackers to trigger outbound requests to arbitrary domains. This issue has been patched in version 4.7.0.

Weakness: CWE-922, CWE-918

Which versions are affected by CVE-2026-33407?

It affects 1 product.

Products include Wallosapp Wallos.

How do I fix CVE-2026-33407?

No fix has been published for CVE-2026-33407 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-2026-33407 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33407 exists.

Sources

Also known as GHSA-hhjq-82f8-m6rc.