CVE-2026-34457— OAuth2 Proxy: Health Check User-Agent Matching Bypasses Authentication in auth_request Mode
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I. Basic Information for CVE-2026-34457
Vulnerability Information
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Vulnerability Title
OAuth2 Proxy: Health Check User-Agent Matching Bypasses Authentication in auth_request Mode
Source: NVD (National Vulnerability Database)
Vulnerability Description
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled. In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用欺骗进行的认证绕过
Source: NVD (National Vulnerability Database)
Vulnerability Title
OAuth2 Proxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OAuth2 Proxy是一款能够提供与Google、Github或其他提供商进行身份验证的反向代理。 OAuth2 Proxy 7.15.2之前版本存在安全漏洞，该漏洞源于配置相关的身份验证绕过，可能导致未经身份验证的远程攻击者绕过身份验证并访问受保护的上游资源。
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)
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| oauth2-proxy | oauth2-proxy | < 7.15.2 | - |
II. Public POCs for CVE-2026-34457
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Release v7.15.2 · oauth2-proxy/oauth2-proxy · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-34457
IV. Related Vulnerabilities
Same product: oauth2-proxy
- CVE-2026-40575
OAuth2 Proxy has an Authentication Bypass via X-Forwarded-Ur - CVE-2026-41059
OAuth2 Proxy has an Authentication Bypass via Fragment Confu - CVE-2026-40574
OAuth2 Proxy has an Authorization Bypass in Email Domain Val - CVE-2026-34454
OAuth2 Proxy: Session cookie not cleared when rendering sign - CVE-2025-64484
OAuth2-Proxy vulnerable to header smuggling via underscore,
Same vendor: oauth2-proxy
- CVE-2026-40575
OAuth2 Proxy has an Authentication Bypass via X-Forwarded-Ur - CVE-2026-41059
OAuth2 Proxy has an Authentication Bypass via Fragment Confu - CVE-2026-40574
OAuth2 Proxy has an Authorization Bypass in Email Domain Val - CVE-2026-34454
OAuth2 Proxy: Session cookie not cleared when rendering sign - CVE-2025-64484
OAuth2-Proxy vulnerable to header smuggling via underscore,
Same weakness: CWE-290
- CVE-2021-47923
OpenCart 3.0.3.8 Session Fixation via OCSESSID Cookie - CVE-2026-42354
Sentry: Improper authentication on SAML SSO process allows u - CVE-2026-44118
OpenClaw < 2026.4.22 - Owner Context Spoofing via Bearer Tok - CVE-2026-39858
Traefik: Forwarded alias spoofing top pre-auth decision bypa - CVE-2018-25317
Tenda W3002R/A302/W309R V5.07.64_en Cookie Session Weakness
V. Comments for CVE-2026-34457
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