CVE-2026-40574
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
54/100
Published: 2026-04-21
Modified: 2026-11-11
First seen: 2026-11-11
Status: active
Attack Surface
Network
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
High
A:
None
Description
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.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| oauth2_proxy_project | oauth2_proxy | < 7.15.2 |
References & Advisories (1)
Vendor Advisory