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CVE-2026-34454— OAuth2 Proxy: Session cookie not cleared when rendering sign-in page

Quick assessment

Affected
oauth2-proxy oauth2-proxy
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.

OAuth2 Proxy是OAuth2 Proxy组织的一款能够提供与Google、Github或其他提供商进行身份验证的反向代理。 OAuth2 Proxy 7.11.0至7.15.2之前版本存在代码问题漏洞，该漏洞源于回归问题导致在呈现登录页面时无法清除会话Cookie，可能导致在共享工作站或设备上，后续用户可继续使用先前用户的认证会话。

CVSS 3.5 · Low EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2026-34454

Vulnerability Information
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Vulnerability Title
OAuth2 Proxy: Session cookie not cleared when rendering sign-in page
Source: CVE Program / CVE List V5
Vulnerability Description
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the session cookie when rendering the sign-in page. In deployments that rely on the sign-in page as part of their logout flow, a user may be shown the sign-in page while the existing session cookie remains valid, meaning the browser session is not actually logged out. On shared workstations or devices, a subsequent user could continue to use the previous user's authenticated session. Deployments that use a dedicated logout/sign-out endpoint to terminate sessions are not affected. This issue is fixed in 7.15.2
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的会话过期机制
Source: CVE Program / CVE List V5
Vulnerability Title
OAuth2 Proxy 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OAuth2 Proxy是OAuth2 Proxy组织的一款能够提供与Google、Github或其他提供商进行身份验证的反向代理。 OAuth2 Proxy 7.11.0至7.15.2之前版本存在代码问题漏洞，该漏洞源于回归问题导致在呈现登录页面时无法清除会话Cookie，可能导致在共享工作站或设备上，后续用户可继续使用先前用户的认证会话。
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
oauth2-proxy oauth2-proxy >= 7.11.0, < 7.15.2 -

II. Public POCs for CVE-2026-34454

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III. Intelligence Information for CVE-2026-34454

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Vendor Advisories for CVE-2026-34454 (1)

Vendor Pages for CVE-2026-34454 (1)

IV. Related Vulnerabilities

Same product: oauth2-proxy
Same vendor: oauth2-proxy
Same weakness: CWE-613

V. Comments for CVE-2026-34454

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