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

> CVE-2026-34969: Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-34969
Last updated: 2026-10-23T23:10:00Z

- Published: 2026-04-06 16:01 UTC · Updated: 2026-10-23 23:10 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.27%, 19th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-200, CWE-598

## 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.

## Affected vendors and products

- nhost: nhost

## Tracked companies

- [Nhost](https://rewindex.com/company/nhost.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-34969)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-34969)
- [https://github.com/nhost/nhost/security/advisories/GHSA-g2qj-prgh-4g9r](https://github.com/nhost/nhost/security/advisories/GHSA-g2qj-prgh-4g9r)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-34969 · Markdown: https://rewindex.com/cve/CVE-2026-34969.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-34969 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:27.506Z