VIR Vulnerability Intelligence Relay

CVE-2026-40574

medium
Published 2026-04-21 · Modified 2026-05-05
CVSS v3
6.8
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v2
—
VIR risk
6.8

Description

OAuth2 Proxy has an Authorization Bypass in Email Domain Validation via Malformed Multi-@ Email Claims

Predictions

Exploit likelihood
77%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

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

Package impact
EcosystemPackageVulnerableFixed
golang Gogithub.com/oauth2-proxy/oauth2-proxy/v7<7.15.27.15.2

Application impact
VendorProductVersionsFixed
oauth2_proxy_projectoauth2_proxy{"endExcluding":"7.15.2"}7.15.2

References

CWEs

CWE-863

Verify integrity in audit chain (admin only). AS-IS.