SB2026030531 - Multiple vulnerabilities in OpenID Connect / OAuth client module for Drupal

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2026-3530)

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

2) Improper access control (CVE-ID: CVE-2026-3532)

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the affected module does not sufficiently validate the uniqueness of certain user fields depending on the database engine and its collation. A remote user can register with the same email address as another user.

3) Improper access control (CVE-ID: CVE-2026-3531)

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote user can bypass implemented security restrictions and maintain their session at the Identity Provider.

Remediation

Install update from vendor's website.

References

• https://www.drupal.org/sa-contrib-2026-025
• https://www.drupal.org/sa-contrib-2026-027
• https://www.drupal.org/sa-contrib-2026-026