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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (28.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Nhost — versions < 0.48.0
- Nhost Nhost\/auth
Weakness classification (CWE)
References
- github.com/nhost/nhost/security/advisories/GHSA-g2qj-prgh-4g9r (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.