Elementor RSS Feed Stored XSS Injection Flaw

The Unlimited Elements for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '<title>/<description> inside the attacker-controlled RSS feed body' parameter in all versions up to, and including, 2.0.26 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 is exploitable against any site whose administrator has placed the RSS Feed catalog widget pointing at a feed URL the attacker controls, as the plugin's own 2.0.25 escaping pre-processor intentionally excludes |raw prints in element content positions from its escaping logic, and XML entity-encoded payloads in feed item titles are decoded back to raw markup before reaching the sink.

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 Unlimited Elements for Elementor plugin contains a critical stored cross-site scripting (XSS) vulnerability in versions up to 2.0.26 that allows unauthenticated attackers to inject malicious JavaScript through RSS feed title and description parameters. Because the plugin fails to properly sanitize and escape user-controlled input from RSS feeds, attackers can craft malicious feeds that, when processed by site administrators, execute arbitrary scripts in the browsers of anyone visiting affected pages. This vulnerability poses a significant risk to WordPress sites using this popular page builder extension, potentially affecting thousands of websites and enabling attackers to steal credentials, redirect users, or compromise site integrity without requiring authentication.

Casky's 323 matching skills leverage Claude AI's extended reasoning to map attack patterns across MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0043 (Reconnaissance), enabling practitioners to identify both the exploitation chain and initial access vectors. Practitioners would observe detections for CWE-79 input validation failures, flagging unescaped RSS feed parameters flowing into page output. The skills analyze how attacker-controlled content persists in the application layer, correlating suspicious RSS feed injection attempts with subsequent script execution events. By examining the interaction between external feed sources and stored page content, Casky helps security teams spot indicators like encoded payloads in RSS bodies, unusual feed URL modifications, and script tags appearing in administrator-controlled content—revealing the full attack progression from malicious feed injection through persistent payload delivery to end users.

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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-2026-116558.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

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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-2026-116558

Casky has 323 skills that investigate the attack patterns behind CVE-2026-116558. Run one and get CVSS-scored findings in 3 minutes.

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