Stored XSS in Simply Schedule Appointments Plugin

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Stored XSS.This issue affects Simply Schedule Appointments: from n/a through 1.6.12.35.

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

Simply Schedule Appointments, a WordPress plugin used for appointment scheduling, contains a Stored Cross-Site Scripting (XSS) vulnerability affecting versions through 1.6.12.35. This vulnerability allows attackers to inject malicious JavaScript code that persists in the application's database, executing whenever users view affected pages. Stored XSS is particularly dangerous because it compromises the integrity of web applications and can lead to session hijacking, credential theft, malware distribution, and unauthorized administrative actions. Organizations relying on this plugin for client-facing scheduling are at risk, as are their users whose browsers execute the attacker's payload.

Casky's 323 matching skills leverage Claude's extended reasoning to map this vulnerability across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would identify detection patterns for: (1) CWE-79 input validation failures in form submissions and database storage mechanisms, (2) execution of unvalidated script payloads in user-controlled content areas, and (3) reconnaissance activities where attackers probe scheduling endpoints for injection points. The platform's skills would surface findings showing how malicious actors craft appointment data containing script tags, exploit insufficient output encoding, and achieve persistence through stored payloads—enabling security teams to prioritize remediation, implement input sanitization, and deploy WAF rules to block XSS patterns before they reach production systems.

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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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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-2026-110382.

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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