CVE-2026-34969

HIGH

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

Title source: cna

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.

References (1)

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

Scores

CVSS v3 7.5

EPSS 0.0004

EPSS Percentile 12.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-200 CWE-598

Status published

Products (3)

nhost/nhost 0 - 0.0.0-20260330133707-294954e0fc3aGo

nhost/nhost < 0.48.0

nhost/nhost\/auth < 0.48.0

Published Apr 06, 2026

Tracked Since Apr 06, 2026