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High, CVSS 8.1

Drupal OAuth2 Server Missing Authorization vulnerability

CVE-2025-31691GHSA-4f8q-mwgc-3mwc

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (drupal/oauth2_server 2.1.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U · score source
EPSS
  • CVE-2025-31691: 0.43% estimated exploitation activity in the next 30 days; percentile 37.74 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-4f8q-mwgc-3mwc

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-31691

Advisory: Drupal OAuth2 Server Missing Authorization vulnerability
IDs: CVE-2025-31691, GHSA-4f8q-mwgc-3mwc
Record: https://patchnext.com/advisories/cve-2025-31691 (revision 1, source checked 26 Oct 2026, 14:33 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: drupal/oauth2_server 2.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist drupal/oauth2_server: affected < 2.1.0; fixed in 2.1.0

## Suggested inspection (read-only)
- Packagist drupal/oauth2_server: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on drupal/oauth2_server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4f8q-mwgc-3mwc (GitHub-reviewed advisory GHSA-4f8q-mwgc-3mwc lists affected ranges: Packagist drupal/oauth2_server >=0 <2.1.0)

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