CVE-2019-9837

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-03-21 · updated 2026-06-17
Weakness: CWE-601

Description

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.

Affected products

OpenID Connect: from 1.4.0 before 1.5.4 — fixed in 1.5.4

How to fix

Upgrade to a fixed version: OpenID Connect 1.5.4. Check the vendor advisory for mitigations.

References

https://github.com/doorkeeper-gem/doorkeeper-openid_connect/blob/master/CHANGELOG.md
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/issues/61
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/pull/66
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/blob/master/CHANGELOG.md
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/issues/61
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/pull/66

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