RegistrationMagic Plugin Stored XSS via Unescaped Form Fields

The RegistrationMagic WordPress plugin before 6.0.9.9 does not escape a registration form field value before outputting it in an HTML attribute on an administrative page, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against high privilege users such as admin.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched 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

RegistrationMagic, a popular WordPress plugin for managing user registrations, contains a critical stored cross-site scripting (XSS) vulnerability in versions before 6.0.9.9. The plugin fails to properly escape user-supplied registration form field values before displaying them in HTML attributes on administrative pages. This allows unauthenticated attackers to inject malicious JavaScript that persists in the database and executes whenever administrators view affected pages, potentially compromising high-privilege user accounts and enabling further lateral movement within WordPress installations.

Casky.ai's 323 mapped skills detect this vulnerability pattern by analyzing attack chains across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would observe detections for CWE-79 violations through multiple skill layers: first, identification of unsanitized input reaching HTML output contexts; second, recognition of the attack flow where unauthenticated users submit payloads that echo back in admin panels (TA0001); and third, detection of reconnaissance-phase activity as attackers probe form fields to discover injectable parameters. Claude's extended reasoning capabilities correlate these signals to surface the stored XSS attack pattern, enabling security teams to prioritize patching this plugin and audit existing registration data for injected content before exploitation occurs at scale.

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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 →

323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-77792.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

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