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

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

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Mar 2026
- **Updated:** 26 Mar 2026
- **Also known as:** GHSA-hhjq-82f8-m6rc

## 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 (Insecure Storage of Sensitive Information), CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-33407?

It affects 1 product.


Products: 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.

## Is CVE-2026-33407 being exploited?

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

## Other vulnerabilities in ellite Wallos

- [CVE-2024-55371](https://insights.sbomify.com/CVE-2024-55371/): File upload in n/a (critical 9.8)
- [CVE-2024-55372](https://insights.sbomify.com/CVE-2024-55372/): File upload in n/a (critical 9.8)
- [CVE-2026-30840](https://insights.sbomify.com/CVE-2026-30840/): Wallos: Server-Side Request Forgery (SSRF) in Notification Testers (high 8.8)
- [CVE-2026-30828](https://insights.sbomify.com/CVE-2026-30828/): Wallos: SSRF via url parameter leading to File Traversal (high 8.7)
- [CVE-2024-29320](https://insights.sbomify.com/CVE-2024-29320/): SQL injection in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33407 and fix it if it is affected.

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

Affected product: ellite Wallos. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33407/ (Markdown: https://insights.sbomify.com/CVE-2026-33407/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33407
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33407
- OSV: https://osv.dev/vulnerability/CVE-2026-33407

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33407/
Summaries are generated and may contain mistakes; the official description above is the record.