WordPress Calendar Plugin Stored XSS via Unsanitized Input

The CP Multi View Events Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'CalendarTitle' parameter in all versions up to, and including, 1.4.42 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires that an administrator has enabled the "Allow edition in frontend?" option on at least one calendar view, which exposes the unauthenticated add endpoint and a publicly accessible nonce.

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 CP Multi View Events Calendar plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the 'CalendarTitle' parameter affecting all versions up to 1.4.42. Due to insufficient input sanitization and output escaping, unauthenticated attackers can inject arbitrary JavaScript that persists in the database and executes whenever users view affected pages. This vulnerability is particularly dangerous because it targets WordPress administrators who have enabled frontend editing capabilities, potentially compromising site visitors and enabling credential theft, malware distribution, or complete site takeover. With a CVSS score of 7.2 and no current evidence of active exploitation, the risk window remains open for widespread attacks against the estimated thousands of WordPress installations using this plugin.

Casky's skill mapping across MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0043 (Reconnaissance) combined with 323 relevant security skills enables practitioners to detect this attack pattern through multiple detection vectors. When analyzing this vulnerability, practitioners would identify malicious payloads injected into the CalendarTitle parameter by correlating input validation failures (CWE-79 indicators) with suspicious script tag patterns in database queries and HTTP requests. Casky's Claude-powered extended reasoning would flag the absence of proper output encoding in rendered calendar titles, surface the permission misconfiguration risk (frontend editing enabled), and highlight the persistent nature of stored XSS through attack chain analysis. Security teams would see detailed findings showing how injected scripts execute in user browsers during page load, enabling lateral movement and privilege escalation within WordPress environments.

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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-2026-110701.

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-2026-110701

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