Turisbook Plugin Stored XSS via Unprotected Settings

The Turisbook Booking System WordPress plugin through 1.3.8 does not have authorisation and CSRF checks when saving its settings, and does not sanitise and escape one of them before outputting it in an admin page, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against administrators.

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

The Turisbook Booking System WordPress plugin versions through 1.3.8 contain a critical stored cross-site scripting (XSS) vulnerability in its admin settings functionality. The vulnerability exists because the plugin fails to implement proper authorization checks, CSRF protection, and input sanitization when saving configuration parameters. This allows unauthenticated attackers to inject malicious JavaScript that persists in the database and executes whenever administrators access the affected settings page. WordPress sites using this plugin are at immediate risk, as administrators represent high-value targets for credential theft, malware distribution, and lateral movement within organizational networks.

Casky's 323 matching skills leverage Claude's extended reasoning to detect the attack chain across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would identify detection patterns including: unauthorized POST requests to wp-admin settings endpoints lacking valid nonces, payloads containing script tags or event handlers in plugin option fields, and admin session anomalies following settings modifications. The platform maps these indicators to CWE-79 validation failures and correlates them with common stored XSS exploitation signatures—such as base64-encoded payloads, Unicode escaping, or HTML entity obfuscation—that attackers use to bypass basic filters. Security teams gain visibility into both the exploitation vector (unauthenticated settings modification) and the persistence mechanism (stored payload execution), enabling rapid response before administrator compromise 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-2026-103303.

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-2026-103303

Casky has 323 skills that investigate the attack patterns behind CVE-2026-103303. Run one and get CVSS-scored findings in 3 minutes.

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