CVE-2026-34454: OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers

Routine

LOW 3.5UPGRADE

CVE-2026-34454 is a low-severity flaw (CVSS 3.5) 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. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the session cookie when rendering the sign-in page. In deployments that rely on the sign-in page as part of their logout flow, a user may be shown the sign-in page while the existing session cookie remains valid, meaning the browser session is not actually logged out. On shared workstations or

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-384, CWE-613
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: >= 7.11.0 and < 7.15.2

Fixed in: 7.15.2

Safe to downgrade to: a release before 7.11.0

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.

3. If no update is available yet, DOWNGRADE to a release before 7.11.0 (Debian / Ubuntu)

apt-cache madison oauth2-proxy sudo apt install oauth2-proxy=<VERSION_BEFORE_7.11.0> sudo apt-mark hold oauth2-proxy

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oauth2-proxy sudo dnf downgrade oauth2-proxy-<VERSION_BEFORE_7.11.0> sudo dnf versionlock add oauth2-proxy

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-34454?

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

Is CVE-2026-34454 being exploited?

CVE-2026-34454 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-2026-34454 affect?

CVE-2026-34454 affects oauth2 proxy. Severity is low (CVSS 3.5). OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the session cookie when rendering the sign-in page. In deployments that rely on the s

How urgent is CVE-2026-34454?

Priority 14/100. No elevated risk signals yet.

Related CVEs

CVE-2026-34457 CRITICAL 9.1 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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