CVE-2026-34457: OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers

Q: How do I fix CVE-2026-34457?

oauth2 proxy: upgrade to 7.15.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-34457 being exploited?

CVE-2026-34457 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34457 affect?

CVE-2026-34457 affects oauth2 proxy. Severity is critical (CVSS 9.1). 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 integ

Q: How urgent is CVE-2026-34457?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-34457 is a critical-severity flaw (CVSS 9.1) affecting oauth2 proxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-290
Published	2026-04-14
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: oauth2 proxy project

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 23:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

oauth2 proxy project oauth2 proxy UPGRADE

Affected: < 7.15.2

Fixed in: 7.15.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy oauth2-proxy || rpm -q oauth2-proxy || oauth2-proxy --version

2. UPGRADE to 7.15.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade oauth2-proxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oauth2-proxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34457?

oauth2 proxy: upgrade to 7.15.2. Exact commands for each OS are on this page.

Is CVE-2026-34457 being exploited?

CVE-2026-34457 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34457 affect?

CVE-2026-34457 affects oauth2 proxy. Severity is critical (CVSS 9.1). 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 integ

How urgent is CVE-2026-34457?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

nginx vulnerabilities

Related CVEs

CVE-2026-34454 LOW 3.5 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
CVE-2026-40575 CRITICAL 9.1 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
CVE-2026-41059 HIGH 8.2 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
CVE-2026-40574 MEDIUM 6.8 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers

References

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