Information disclosure in Nhost
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.
Vulnerability class: Information Disclosure
EPSS: 0.003 (18.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Nhost — versions < 0.48.0
- Nhost Nhost\/auth
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-34969?
- CVE-2026-34969 is a high-severity vulnerability in Nhost, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-04-06.
- How severe is CVE-2026-34969?
- High severity. CVSS v3 base score is 7.5 out of 10.