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

Quick assessment

Affected
gijo Flying Scripts: Delay JavaScript to Improve Site Speed & Performance
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 "The Flying Scripts: Delay JavaScript to Improve Site Speed & Performance" 在所有 1.2.4 及更早版本中，存在存储型跨站脚本（Stored XSS）漏洞，原因是“评论”（comment）参数缺乏足够的输入清理和输出转义。该漏洞允许未认证的攻击者在页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。 该利用方式完全绕过了 WordPress 核心在保存阶段使用的 kses 清理机制，因为攻击载

CVSS 7.2 · High EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
gijo Flying Scripts: Delay JavaScript to Improve Site Speed & Performance ≤ 1.2.4 affected
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I. Basic Information for CVE-2026-109990

Vulnerability Information
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Vulnerability Title
Flying Scripts: Delay JavaScript to Improve Site Speed & Performance <= 1.2.4 - Unauthenticated Stored Cross-Site Scripting via Comment Content
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
gijo Flying Scripts: Delay JavaScript to Improve Site Speed & Performance 0 ~ 1.2.4 -

II. Public POCs for CVE-2026-109990

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III. Intelligence Information for CVE-2026-109990

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Patches & Fixes for CVE-2026-109990 (1)

Vendor Pages for CVE-2026-109990 (2)

Other References for CVE-2026-109990 (1)

IV. Related Vulnerabilities

Same vendor: gijo
Same weakness: CWE-79

V. Comments for CVE-2026-109990

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