Improper Authorization in Doorkeeper - #VU140708
Published: August 1, 2026
Vulnerability identifier: #VU140708
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
Doorkeeper
Doorkeeper
Detailed vulnerability description
The vulnerability allows a remote attacker to revoke tokens without correct authorization.
The vulnerability exists due to improper authorization in the OAuth token revocation endpoint when handling token revocation requests for public (non-confidential) clients. A remote attacker can send a crafted token revocation request to revoke tokens without correct authorization.
Only deployments using public (non-confidential) clients in the OAuth token revocation flow are vulnerable.
Remediation
Install security update from vendor's website.