CVE-2026-3532Network attack vector

Privilege escalation via case-variant duplicate email registration

Published Mar 26, 2026 · Updated Mar 26, 2026

Privilege escalation in Drupal OpenID Connect / OAuth client before 1.5.0 allows remote authenticated users to register duplicate email addresses. During first-time identity-provider sign-in, the module checks user-field uniqueness without normalizing case consistently with the database collation. Exploitation requires a valid identity-provider sign-in and a collation that treats case variants as equivalent, causing duplicate identities and data-integrity errors.

CVSS severity4.2
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Privilege escalation in Drupal OpenID Connect / OAuth client before 1.5.0 allows remote authenticated users to register duplicate email addresses. During first-time identity-provider sign-in, the module checks user-field uniqueness without normalizing case consistently with the database collation. Exploitation requires a valid identity-provider sign-in and a collation that treats case variants as equivalent, causing duplicate identities and data-integrity errors.

The record

CVE
CVE-2026-3532
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
Avatar Uploader Project
Product
OpenID Connect / OAuth client
Classifications
CWE-178, CAPEC-233, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0 <1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Avatar Uploader Project · OpenID Connect / OAuth clientversion=0.0.0 <1.5.0

Published CVSS scores

4.2CISA-ADPCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
4.2NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-178Improper Handling of Case Sensitivity
CAPEC-233Privilege Escalation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo