Doorkeeper · Doorkeeper::Openidconnect · CVE-2019-9837
**Name of the Vulnerable Software and Affected Versions**
Doorkeeper::OpenidConnect versions 1.4.x through 1.5.3
**Description**
The issue allows for an open redirect via the `redirect uri` field in an OAuth authorization request, resulting in an error response when the 'openid' scope and a `prompt=none` value are used. This can be exploited for phishing attacks against the authorization flow.
**Recommendations**
For versions 1.4.x through 1.5.3, consider restricting the use of the `redirect uri` field in OAuth authorization requests with the 'openid' scope and a `prompt=none` value to prevent open redirects. As a temporary workaround, restrict access to the authorization flow to minimize the risk of phishing attacks until a patch is available.