Unauthorized Role Assignment in Ultimate Member WordPress Plugin
CVE-2026-19423

8.1HIGH

Key Information:

Vendor

WordPress
Status
Ultimate Member
Vendor
CVE Published:
28 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19423?

The Ultimate Member WordPress plugin, prior to version 2.13.0, is susceptible to an improper input validation issue that allows unauthenticated users to manipulate role selections on their profile forms. Instead of validating the selected roles against a specific allow-list, the plugin incorrectly checks these values against the site's registered role names. This flaw could permit unauthorized individuals to assign themselves arbitrary capabilities, potentially granting them administrator-equivalent access without proper authentication.

Affected Version(s)

Ultimate Member 2.6.7 < 2.13.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-19423 - Proof of Concept

References

https://wpscan.com/vulnerability/3cdc8700-165a-4787-a3d0-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jakub Herman
WPScan
.