CVE Catalog

CVE-2026-109990

HighCVSS 7.2
Published: Translated: NVD NIST

Summary

The Flying Scripts plugin for WordPress (versions up to and including 1.2.4) is vulnerable to stored cross-site scripting via the 'comment' parameter due to insufficient input sanitization and output escaping. The payload uses only kses-allowed elements, and the XSS is introduced post-save by the plugin's output-buffer rewriter.

Risk Assessment

An unauthenticated attacker can inject arbitrary web scripts into pages that execute when a user visits the injected page, potentially leading to session theft or other actions in the victim's browser context.

Recommendation

Update the Flying Scripts plugin to a version newer than 1.2.4.

Related vulnerabilities

Original NVD description (English source)

The Flying Scripts: Delay JavaScript to Improve Site Speed & Performance plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 1.2.4 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. The exploit bypasses WordPress core's save-time kses sanitization entirely because the payload uses only kses-allowed elements — an <abbr title> attribute and <code> text content — and the XSS is introduced post-save when the plugin's output-buffer rewriter substitutes a double-quote-bearing <code> body into the <abbr title> attribute via predictable, unsalted ___noise___ placeholder keys.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS