Unauthenticated Cross-Site Scripting in WP Mailster Plugin

Unauthenticated Cross Site Scripting (XSS) in WP Mailster <= 1.9.0.0 versions.

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

CVE-2026-105061 represents a high-severity unauthenticated Cross-Site Scripting (XSS) vulnerability affecting WP Mailster versions up to 1.9.0.0. This CWE-79 weakness allows attackers to inject malicious scripts without authentication, meaning any unauthenticated user can craft and deliver XSS payloads. Given that WP Mailster is a popular WordPress email plugin, this vulnerability poses significant risk to WordPress site administrators and their users. Successful exploitation enables attackers to steal session tokens, harvest credentials, redirect users to malicious sites, or deface website content—all without requiring prior access to the WordPress admin panel.

Casky.ai maps 323 security skills to detect the attack patterns underlying this vulnerability, with particular focus on TA0001 (Initial Access) and TA0043 (Reconnaissance). Claude's extended reasoning capabilities enable practitioners to identify reconnaissance activities where attackers probe for unvalidated input fields in WP Mailster's user-facing forms, and detect the initial access attempts when XSS payloads are injected through vulnerable parameters. In Casky findings, practitioners would observe detection signals for DOM-based and reflected XSS patterns, input validation bypasses, and suspicious script execution contexts. The 323 mapped skills provide layered detection across input sanitization failures, output encoding gaps, and JavaScript execution anomalies—allowing security teams to correlate threat activity to this specific plugin weakness and prioritize remediation of WP Mailster installations before exploitation occurs.

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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-2026-105061.

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

Investigate the attack patterns behind CVE-2026-105061

Casky has 323 skills that investigate the attack patterns behind CVE-2026-105061. Run one and get CVSS-scored findings in 3 minutes.

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