CVE-2026-3531: OpenID Connect / OAuth client - Moderately critical - Access bypass - SA-CONTRIB-2026-026

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-26 · updated 2026-06-17
Weakness: CWE-288

Description

Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect / OAuth client allows Authentication Bypass.This issue affects OpenID Connect / OAuth client: from 0.0.0 before 1.5.0.

Affected products

Drupal OpenID Connect / OAuth client: before 8.x-1.5 — fixed in 8.x-1.5

How to fix

Upgrade to a fixed version: Drupal OpenID Connect / OAuth client 8.x-1.5. Check the vendor advisory for mitigations.

References

https://www.drupal.org/sa-contrib-2026-026

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