Vulnerability · Published Apr 6, 2026 · Assigned by GitHub_M
CVE-2026-34969Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback
Low 2.3
In plain English
A low-severity information exposure in nhost from nhost. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/nhost/nhost | 0.0.0-20260330133707-294954e0fc3a | GHSA-g2qj-prgh-4g9r |
| Go | github.com/nhost/nhost | 0.0.0-20260330133707-294954e0fc3a | GO-2026-5388 |
Affected products (as reported)
Weakness: CWE-200, CWE-598 · 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
References
- https://github.com/nhost/nhost/security/advisories/GHSA-g2qj-prgh-4g9r x_refsource_CONFIRM