WordPress Breakdance Plugin Stored XSS via Fields Parameter

The Breakdance plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'fields' parameter in versions up to, and including, 2.7.1 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.

Casky was already ahead

This CVE exploits attack patterns that Casky's 322matched 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 Breakdance plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in versions up to 2.7.1, where the 'fields' parameter fails to properly sanitize and escape user input. This allows unauthenticated attackers to inject malicious JavaScript that persists in the database and executes whenever any user visits the affected page. Given Breakdance's popularity as a page builder plugin, this vulnerability poses significant risk to WordPress administrators and their site visitors, potentially leading to credential theft, malware distribution, session hijacking, and defacement of trusted content.

Casky's 322 mapped skills leverage Claude's extended reasoning to detect the attack patterns behind this vulnerability across two critical MITRE ATT&CK techniques: TA0001 (Reconnaissance) and TA0043 (Reconnaissance for Initial Access). Practitioners using Casky would identify suspicious payloads in HTTP requests targeting the 'fields' parameter, recognize encoding bypasses attempting to evade sanitization filters, and detect stored malicious scripts through content analysis and DOM manipulation patterns. The platform would surface indicators such as unusual parameter values in POST requests to page builder endpoints, unexpected script tags in database content, and client-side execution patterns that deviate from legitimate Breakdance functionality, enabling security teams to proactively block exploitation attempts and identify compromised pages before attackers achieve their objectives.

Live Threat IntelligenceComing soon

Casky Risk Score

—

EPSS Probability

—

Shodan Exposure

—

GreyNoise Signal

—

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 →

322 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-7543.

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-2026-7543

Casky has 322 skills that investigate the attack patterns behind CVE-2026-7543. Run one and get CVSS-scored findings in 3 minutes.

Run the skill that detects this →

X Instagram LinkedIn