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CVE-2026-34969— Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback

Quick assessment

Affected
nhost nhost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nhost是Nhost开源的一个后端即服务平台。 Nhost 0.48.0之前版本存在安全漏洞，该漏洞源于身份验证服务的OAuth提供者回调流程将刷新令牌直接放入重定向URL作为查询参数，可能导致刷新令牌泄露。

AI Predicted 6.8 Difficulty: Easy EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-34969

Vulnerability Information
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Vulnerability Title
Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Nhost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nhost是Nhost开源的一个后端即服务平台。 Nhost 0.48.0之前版本存在安全漏洞，该漏洞源于身份验证服务的OAuth提供者回调流程将刷新令牌直接放入重定向URL作为查询参数，可能导致刷新令牌泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nhost nhost < 0.48.0 -

II. Public POCs for CVE-2026-34969

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III. Intelligence Information for CVE-2026-34969

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Vendor Advisories for CVE-2026-34969 (1)

IV. Related Vulnerabilities

Same product: nhost
Same vendor: nhost
Same weakness: CWE-200

V. Comments for CVE-2026-34969

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