CVE-2016-6582: Doorkeeper Project Doorkeeper

Critical severity, CVSS 9.1. EPSS: 4.8% chance of exploitation in the next 30 days.

The Doorkeeper gem before 4.2.0 for Ruby might allow remote attackers to conduct replay attacks or revoke arbitrary tokens by leveraging failure to implement the OAuth 2.0 Token Revocation specification.

Affected products

• Doorkeeper Project Doorkeeper: up to and including 4.1.0

Published 2017-01-23. Last modified 2026-06-17.