CVE-2026-34969

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.

CVSS 4.0

2.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-25)

CWEs

CWE-200, CWE-598

Published

2026-04-06

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

Affected

• nhost:nhost\/auth

Packages (OSV)

References

• 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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