CVE-2026-118554
OpenID Connect Client - Moderately critical - Improper authentication - SA-CONTRIB-2026-287
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect Client allows Authentication Bypass. This issue affects OpenID Connect Client versions: from 0.0.0 to 2.3.1.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
OpenID Connect Client - Moderately critical - Improper authentication - SA-CONTRIB-2026-287
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect Client allows Authentication Bypass. This issue affects OpenID Connect Client versions: from 0.0.0 to 2.3.1.
- Record
CVE-2026-118554- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-288
- Updated
- 2026-11-06
EUVDEUVD-2026-113687
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect Client allows Authentication Bypass. This issue affects OpenID Connect Client versions: from 0.0.0 to 2.3.1.
- Record
EUVD-2026-113687- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-06
GitHub AdvisoriesGHSA-rvvv-5cm6-2jq5
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect...
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect Client allows Authentication Bypass. This issue affects OpenID Connect Client versions: from 0.0.0 to 2.3.1.
- Record
GHSA-rvvv-5cm6-2jq5- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-288
- Updated
- 2026-11-06
NVD
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect Client allows Authentication Bypass. This issue affects OpenID Connect Client versions: from 0.0.0 to 2.3.1.
- Record
CVE-2026-118554- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-288
- Updated
- 2026-11-06
OSV
OpenID Connect Client - Moderately critical - Improper authentication - SA-CONTRIB-2026-287
Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect Client allows Authentication Bypass. This issue affects OpenID Connect Client versions: from 0.0.0 to 2.3.1.
- Record
CVE-2026-118554- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-288
- Updated
- 2026-11-07
OSVDRUPAL-CONTRIB-2026-287 No score
The module enables authentication via the OpenID Connect (oAuth2) protocol.
When a new user logs in via OpenID Connect, the module tries to link the user to an existing account with the same email address. Doing so it allows to take over any existing Drupal account (except user 1) that has not yet been linked to an OpenID Connect user.
This vulnerability is mitigated by the fact that the site must be configured to use a provider that doesn't verify the email address of the user.
- Record
DRUPAL-CONTRIB-2026-287- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
drupal/oidcPackagist:https://packages.drupal.org/8 |
before 2.3.1 | 2.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| severity | CVE List | |
| facts, severity | EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-118554 is a medium vulnerability (CVSS 5.4) in Drupal Openid Connect Client, published October 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 12th percentile. Fixed in drupal/oidc 2.3.1.