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CVE-2026-66570— WordPress WordPress File Upload plugin <= 5.2.1 - Cross Site Scripting (XSS) vulnerability

Quick assessment

Affected
Nickboss WordPress File Upload
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.

Nickboss 开发的 WordPress 插件"File Upload"（wp-file-upload）存在“在生成网页期间未能正确净化输入（跨站脚本攻击）”的漏洞，导致可发生存储型跨站脚本攻击（Stored XSS）。该问题影响 WordPress File Upload 插件从未知版本起至 5.2.1 版本的所有版本。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-66570

Vulnerability Information
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Vulnerability Title
WordPress WordPress File Upload plugin <= 5.2.1 - Cross Site Scripting (XSS) vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Nickboss WordPress File Upload wp-file-upload allows Stored XSS.This issue affects WordPress File Upload: from n/a through 5.2.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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
Nickboss WordPress File Upload 0 ~ 5.2.1 -

II. Public POCs for CVE-2026-66570

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III. Intelligence Information for CVE-2026-66570

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Other References for CVE-2026-66570 (1)

IV. Related Vulnerabilities

Same product: WordPress File Upload
Same vendor: Nickboss
Same weakness: CWE-79