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TI-2026-26719 Aliases CVE-2026-34454GHSA-f24x-5g9q-753f

OAuth2 Proxy: Session cookie not cleared when rendering sign-in page

Priority LOW 16CWE-384Published · Updated

Key facts

Attack vector
Physical
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing, Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-384 and CWE-613.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00183 7th percentileScored 2026-11-07
Fix Fixed oauth2-proxy (oauth2-proxy): 7.15.2github.com/oauth2-proxy/oauth2-proxy/v7 (Go): 7.15.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
oauth2-proxyoauth2-proxy7.11.0 to before 7.15.27.15.2Patch availableCNA
—github.com/oauth2-proxy/oauth2-proxy/v7 (Go)7.11.0 to before 7.15.27.15.2Patch availableGHSA-f24x-5g9q-753f
  • oauth2-proxy Vendoroauth2-proxy Affected 7.11.0 to before 7.15.2 Fixed in 7.15.2 Patch available CNA
  • github.com/oauth2-proxy/oauth2-proxy/v7 (Go) Vendor— Affected 7.11.0 to before 7.15.2 Fixed in 7.15.2 Patch available GHSA-f24x-5g9q-753f

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:*7.11.0 to before 7.15.2Vulnerableoauth2-proxy
  • cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:* Versions 7.11.0 to before 7.15.2 Vulnerable ·oauth2-proxy

Remediation

  • Fix · CNA oauth2-proxy (oauth2-proxy) Fixed in 7.15.2
  • Fix · GHSA-f24x-5g9q-753f github.com/oauth2-proxy/oauth2-proxy/v7 (Go) Fixed in 7.15.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34454
  2. 2026-10-03 Alias added: GHSA-f24x-5g9q-753f

References

Advisory 2

Other 3

  • TI-2025-34353 OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion CVSS 3.1CRITICAL 9.1
  • TI-2026-29315 OAuth2 Proxy has an Authentication Bypass via X-Forwarded-Uri Header Spoofing CVSS 3.1CRITICAL 9.1
  • TI-2026-26722 OAuth2 Proxy: Health Check User-Agent Matching Bypasses Authentication in auth_request Mode CVSS 3.1CRITICAL 9.1
  • TI-2026-29698 OAuth2 Proxy has an Authentication Bypass via Fragment Confusion in skip_auth_routes and skip_auth_regex CVSS 3.1HIGH 8.2
  • TI-2017-14408 CSRF in Bitly oauth2_proxy 2.1 during authentication flow CVSS 3.0HIGH 8.8
  • TI-2020-08927 Open Redirect in OAuth2 Proxy CVSS 3.1HIGH 7.1
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences