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Vulnerability · Published Oct 16, 2026 · Assigned by Wordfence

CVE-2026-109990Flying Scripts: Delay JavaScript to Improve Site Speed & Performance <= 1.2.4 - Unauthenticated Stored Cross-Site Scripting via Comment Content

High 7.2

In plain English

A high-severity cross-site scripting in Flying Scripts: Delay JavaScript to Improve Site Speed & Performance from gijo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High
Exploit odds (30 days)0.3%top 73.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 &lt;abbr title&gt; attribute and &lt;code&gt; text content — and the XSS is introduced post-save when the plugin's output-buffer rewriter substitutes a double-quote-bearing &lt;code&gt; body into the &lt;abbr title&gt; attribute via predictable, unsalted ___noise___ placeholder keys.

Affected products (as reported)

VendorProductVersions
gijo Flying Scripts: Delay JavaScript to Improve Site Speed & Performance 0 – through 1.2.4

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References