CVE-2019-11027: Openid Ruby-Openid

Critical severity, CVSS 9.8. EPSS: 3% chance of exploitation in the next 30 days.

Ruby OpenID (aka ruby-openid) through 2.8.0 has a remotely exploitable flaw. This library is used by Rails web applications to integrate with OpenID Providers. Severity can range from medium to critical, depending on how a web application developer chose to employ the ruby-openid library. Developers who based their OpenID integration heavily on the "example app" provided by the project are at highest risk.

Affected products

• Openid Ruby-Openid: up to and including 2.8.0

Published 2019-06-10. Last modified 2026-06-17.