Is CVE-2026-34457 actively exploited?

No active exploitation of CVE-2026-34457 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34457 be exploited remotely?

Yes. CVE-2026-34457 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34457?

CVE-2026-34457 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-34457

CWE-290Published: April 14, 2026· Updated: Apr 17, 2026

9.1

CVSS v3.1

EPSS:0.07%probability of exploitation in 30 daysPercentile:22.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34457 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.