CVE-2026-34969

Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback

State: Published
Severity: 2.3 Low
Published: Apr 6, 2026
Updated: Apr 7, 2026
Reserved: Mar 31, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	2.3 Low	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	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-598 Use of GET Request Method With Sensitive Query Strings

Affected Products

Product	Versions
nhostnhost	< 0.48.0Affected

References

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

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