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Ultimate Member <= 2.6.6 — Privilege Escalation via Arbitrary User Meta Updates

CVE-2023-3460Published · Updated

Action summary

Affected: ≤2.6.6Update to 2.6.7 or newer

All remediation steps
Watch plugin
Severity
Critical9.8
CVSS
9.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-266 Incorrect Privilege Assignment
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin ultimate-member

  1. Affected≤ 2.6.6
  2. Patched in2.6.7

Update to 2.6.7 or newer.

You are affected if you run ≤ 2.6.6. Version 2.6.7 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 2.6.7, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Marc-Alexandre Montpas.

The Ultimate Member plugin for WordPress is vulnerable to privilege escalation in versions up to, and including, 2.6.6. This is due to the plugin using a predefined list of user meta keys that are banned which can be bypassed via a few method like adding slashes to the user meta key. This makes it possible for unauthenticated attackers to register on a site as an administrator.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin

All 87
More vulnerabilities in Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
SeverityVulnerabilityCVEPublished
Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via Custom Textarea Profile Field
≤2.14.1Update to 2.14.2
CVE-2026-116621
Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via 'user_url' Profile Field
≤2.14.0Update to 2.14.1
CVE-2026-107625
High8.1Unauthenticated PHP Object Injection
≤2.13.1Update to 2.14.0
CVE-2026-115968
High7.5Missing Authorization to Unauthenticated Sensitive Profile Field Disclosure via Member Directory Field Privacy Bypass
≤2.13.1Update to 2.14.0
CVE-2026-93428
High7.2Unauthenticated Stored Cross-Site Scripting via 'form_id' Parameter
≤2.13.1Update to 2.14.0
CVE-2026-96270

Timeline

  1. CVE published

    Severity critical, CVSS 9.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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