WP Booking System Stored XSS in Admin Dashboard

The WP Booking System WordPress plugin before 2.1.0.1 does not sanitise and escape a client-controllable request value before storing it and later outputting it in an administration screen, allowing unauthenticated attackers to perform Stored Cross-Site Scripting attacks that execute in the session of an administrator who views the stored data.

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 WP Booking System WordPress plugin before version 2.1.0.1 contains a critical stored cross-site scripting (XSS) vulnerability that allows unauthenticated attackers to inject malicious JavaScript code into the WordPress administration interface. This vulnerability exploits insufficient input sanitization and output escaping of client-controllable data, enabling attackers to craft malicious requests that store payload data in the plugin's database. When an administrator accesses the affected admin screen to view this data, the injected script executes within their authenticated session, potentially allowing attackers to steal credentials, modify site content, create new admin accounts, or perform other privileged actions. With a CVSS score of 8.8 and affecting a widely-used booking plugin, this poses a significant risk to WordPress installations, particularly those managing bookings or reservations where user-submitted data flows through the vulnerable code paths.

Casky's 323 mapped security skills leverage Claude AI's extended reasoning to detect the attack patterns underlying this vulnerability by analyzing MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would identify suspicious stored XSS attack chains through detection of: (1) anomalous booking form submissions containing script tags or event handlers that bypass validation, (2) database queries storing unescaped user input destined for admin screens, and (3) HTTP responses rendering admin-controlled data without proper output encoding. The platform's skill coverage would surface indicators of compromise such as malicious JavaScript payloads in booking records, unusual administrator session activity following plugin access, and architectural weaknesses in the plugin's input/output handling pipeline—enabling security teams to pinpoint vulnerable plugin versions and remediate before exploitation.

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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-2026-107126.

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-2026-107126

Casky has 323 skills that investigate the attack patterns behind CVE-2026-107126. Run one and get CVSS-scored findings in 3 minutes.

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