CVE-2025-12466: Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Simple OAuth (OAuth2) & OpenI

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2025-12466 is a high-severity flaw (CVSS 7.5) affecting simple oauth. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Simple OAuth (OAuth2) & OpenID Connect allows Authentication Bypass.This issue affects Simple OAuth (OAuth2) & OpenID Connect: from 6.0.0 before 6.0.7.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-288
Published	2025-10-30
Last modified	2026-10-08

Publisher (CNA): Drupal.org · Vendor: simple oauth project

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-30 00:15 UTCPublished CVE record published
2026-10-08 10:10 UTCUpdated Record last modified

simple oauth project simple oauth UPGRADE

Affected: >= 6.0.0 and < 6.0.7

Fixed in: 6.0.7

Safe to downgrade to: a release before 6.0.0

1. Check installed version

apt-cache policy simple-oauth || rpm -q simple-oauth || simple-oauth --version

2. UPGRADE to 6.0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-oauth

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-oauth

Note

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

3. If no update is available yet, DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)

apt-cache madison simple-oauth sudo apt install simple-oauth=<VERSION_BEFORE_6.0.0> sudo apt-mark hold simple-oauth

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simple-oauth sudo dnf downgrade simple-oauth-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add simple-oauth

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-12466?

simple oauth: upgrade to 6.0.7. Exact commands for each OS are on this page.

Is CVE-2025-12466 being exploited?

CVE-2025-12466 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-2025-12466 affect?

CVE-2025-12466 affects simple oauth. Severity is high (CVSS 7.5). Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal Simple OAuth (OAuth2) & OpenID Connect allows Authentication Bypass.This issue affects Simple OAuth (OAuth2) & OpenID Connect: from 6.0.0 before 6.0.7.

How urgent is CVE-2025-12466?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Software pages

Drupal vulnerabilities

References

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