WordPress User Frontend Plugin Role Tampering Flaw

The User Frontend WordPress plugin before 4.3.12 does not prevent tampering with the role assigned by its registration form, allowing unauthenticated users to register with a higher privileged role, such as Editor. This affects installations running a PHP build where the sodium extension is unavailable, and where a registration page has been configured. The administrator role cannot be obtained this way.

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The User Frontend WordPress plugin before version 4.3.12 contains a critical privilege escalation vulnerability that allows unauthenticated users to manipulate role assignments during registration. By tampering with the registration form, attackers can self-assign elevated privileges such as Editor role, bypassing intended access controls. This vulnerability specifically affects WordPress installations running PHP without the sodium extension and where a public registration page is configured. While administrator roles cannot be obtained through this method, Editor access provides significant capabilities to modify content, manage users, and potentially install malicious plugins—making this a serious threat to WordPress site integrity and data security.

Casky.ai's 224 mapped skills detect this attack pattern by analyzing indicators aligned with MITRE ATT&CK technique TA0004 (Privilege Escalation). Practitioners using Casky will identify suspicious registration activities characterized by modified form parameters, unexpected role assignments post-registration, and privilege escalation attempts without corresponding authentication logs. The platform's Claude AI extended reasoning capability correlates anomalous registration metadata, permission mismatches between user creation requests and actual database permissions, and missing cryptographic validation checks (linked to CWE-269: Improper Access Control). Practitioners will observe findings showing users gaining Editor+ capabilities immediately after self-registration, modified HTTP requests during account creation, and PHP environments lacking sodium-based input validation—all indicators of this form-tampering attack vector.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-75823.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004

Investigate the attack patterns behind CVE-2026-75823

Casky has 224 skills that investigate the attack patterns behind CVE-2026-75823. Run one and get CVSS-scored findings in 3 minutes.

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