CVE-2025-31691: Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2

Q: How do I fix CVE-2025-31691?

oauth2 server: upgrade to 2.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-31691 being exploited?

CVE-2025-31691 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-31691 affect?

CVE-2025-31691 affects oauth2 server. Severity is critical (CVSS 9.8). Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.

Q: How urgent is CVE-2025-31691?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-31691 is a critical-severity flaw (CVSS 9.8) affecting oauth2 server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-862
Published	2025-03-31
Last modified	2026-06-17

Publisher (CNA): Drupal.org · Vendor: oauth2 server project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-31 22:15 UTCPublished CVE record published
2026-06-17 09:10 UTCUpdated Record last modified

oauth2 server project oauth2 server UPGRADE

Affected: < 2.1.0

Fixed in: 2.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy oauth2-server || rpm -q oauth2-server || oauth2-server --version

2. UPGRADE to 2.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade oauth2-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oauth2-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-31691?

oauth2 server: upgrade to 2.1.0. Exact commands for each OS are on this page.

Is CVE-2025-31691 being exploited?

CVE-2025-31691 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-31691 affect?

CVE-2025-31691 affects oauth2 server. Severity is critical (CVSS 9.8). Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.

How urgent is CVE-2025-31691?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Drupal vulnerabilities

References

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