CVE-2025-31691: OAUTH2 Server Project OAUTH2 Server

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.

Affected products

• OAUTH2 Server Project OAUTH2 Server: before 2.1.0 (fixed in 2.1.0)

Published 2025-03-31. Last modified 2026-06-17.