CVE-2019-9837: Doorkeeper::OpenidConnect (aka the OpenID Connect extension for Doorkeeper) 1.4.x and 1.5.x before 1.5.4 has a

Routine

MEDIUM 6.1UPGRADE

CVE-2019-9837 is a medium-severity flaw (CVSS 6.1) affecting openid connect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Doorkeeper::OpenidConnect (aka the OpenID Connect extension for Doorkeeper) 1.4.x and 1.5.x before 1.5.4 has an open redirect via the redirect_uri field in an OAuth authorization request (that results in an error response) with the 'openid' scope and a prompt=none value. This allows phishing attacks against the authorization flow.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-601
Published	2019-03-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openid

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-03-21 16:01 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

openid openid connect UPGRADE

Affected: >= 1.4.0 and < 1.5.4

Fixed in: 1.5.4

Safe to downgrade to: a release before 1.4.0

1. Check installed version

apt-cache policy openid-connect || rpm -q openid-connect || openid-connect --version

2. UPGRADE to 1.5.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openid-connect

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openid-connect

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 1.4.0 (Debian / Ubuntu)

apt-cache madison openid-connect sudo apt install openid-connect=<VERSION_BEFORE_1.4.0> sudo apt-mark hold openid-connect

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

dnf --showduplicates list openid-connect sudo dnf downgrade openid-connect-<VERSION_BEFORE_1.4.0> sudo dnf versionlock add openid-connect

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-2019-9837?

openid connect: upgrade to 1.5.4. Exact commands for each OS are on this page.

Is CVE-2019-9837 being exploited?

CVE-2019-9837 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-2019-9837 affect?

CVE-2019-9837 affects openid connect. Severity is medium (CVSS 6.1). Doorkeeper::OpenidConnect (aka the OpenID Connect extension for Doorkeeper) 1.4.x and 1.5.x before 1.5.4 has an open redirect via the redirect_uri field in an OAuth authorization request (that results in an error response) with the 'openid'

How urgent is CVE-2019-9837?

Priority 39/100. No elevated risk signals yet.

Related CVEs

CVE-2022-39387 CRITICAL 9.1 UPGRADE XWiki OIDC has various tools to manipulate OpenID Connect protocol in XWiki

References

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