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CVE-2026-34457

Oauth2 Proxy Project Oauth2 Proxy authentication bypass

9.1 CRITICALEPSS 0.66%
  1. Published14 Apr 2026

Description

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled. In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Oauth2 Proxy Project Oauth2 Proxy< 7.15.2

Remediation

Fixed in
Oauth2 Proxy Project Oauth2 Proxy≥ 7.15.2

References

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Frequently asked

Is CVE-2026-34457 being actively exploited?

CVE-2026-34457 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.66%.

How severe is CVE-2026-34457?

CVE-2026-34457 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.66% probability of exploitation.

Which products are affected by CVE-2026-34457?

Affected products include Oauth2 Proxy Project Oauth2 Proxy.

How do I fix CVE-2026-34457?

Upgrade affected software to a fixed version, for example Oauth2 Proxy Project Oauth2 Proxy 7.15.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34457 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.