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Vulnerability Details CVE-2026-40574

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Prior to 7.15.2, an authorization bypass exists in OAuth2 Proxy as part of the email_domain enforcement option. An attacker may be able to authenticate with an email claim such as attacker@evil.com@company.com and satisfy an allowed domain check for company.com, even though the claim is not a valid email address. The issue ONLY affects deployments that rely on email_domain restrictions and accept email claim values from identity providers or claim mappings that do not strictly enforce normal email syntax. This vulnerability is fixed in 7.15.2.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 12.7%

CVSS Severity

CVSS v3 Score 6.8

References

https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-c5c4-8r6x-56w3

Products affected by CVE-2026-40574

Oauth2 Proxy Project » Oauth2 Proxy » Version: 0.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:0.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 1.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:1.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 1.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:1.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 1.1.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:1.1.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 2.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:2.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 2.0.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:2.0.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 2.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:2.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 2.2

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:2.2
Oauth2 Proxy Project » Oauth2 Proxy » Version: 3.0.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:3.0.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 3.1.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:3.1.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 3.2.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:3.2.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 4.0.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:4.0.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 4.1.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:4.1.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 5.0.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:5.0.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 5.1.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:5.1.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 5.1.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:5.1.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 6.0.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:6.0.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 6.1.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:6.1.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 6.1.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:6.1.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.0.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.0.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.0.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.0.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.1.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.1.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.1.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.1.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.1.2

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.1.2
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.1.3

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.1.3
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.10.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.10.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.11.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.11.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.12.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.12.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.13.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.13.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.14.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.14.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.14.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.14.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.14.2

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.14.2
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.14.3

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.14.3
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.15.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.15.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.15.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.15.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.2.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.2.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.2.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.2.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.3.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.3.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.4.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.4.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.5.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.5.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.5.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.5.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.6.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.6.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.7.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.7.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.7.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.7.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.8.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.8.0
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.8.1

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.8.1
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.8.2

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.8.2
Oauth2 Proxy Project » Oauth2 Proxy » Version: 7.9.0

cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:7.9.0

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Vulnerability Details CVE-2026-40574

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