What is CVE-2025-31691?

CVE-2025-31691 is a critical-severity vulnerability in Drupal Oauth2 Server, classified under Missing Authorization. CVSS score: 9.8/10. Published 2025-03-31.

How severe is CVE-2025-31691?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Drupal Oauth2 Server

CVE-2025-31691

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

Vulnerability class: Broken Access Control

EPSS: 0.004 (32.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Drupal Oauth2 Server — versions 0.0.0
Oauth2_server_project Oauth2_server

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

mlhess@drupal.org (Third Party Advisory)

Frequently asked questions

What is CVE-2025-31691?: CVE-2025-31691 is a critical-severity vulnerability in Drupal Oauth2 Server, classified under Missing Authorization. CVSS score: 9.8/10. Published 2025-03-31.
How severe is CVE-2025-31691?: Critical severity. CVSS v3 base score is 9.8 out of 10.