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CVE-2026-57399— WordPress Proxy & VPN Blocker plugin <= 3.5.8 - Cross Site Scripting (XSS) vulnerability

Quick assessment

Affected
Proxy &amp; VPN Blocker Proxy &amp; VPN Blocker
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 Proxy & VPN Blocker是WordPress基金会的一款基于 proxycheck.io API 的 WordPress 安全插件，可实时检测并阻止 VPN、代理、Tor 节点等匿名流量，同时支持国家/地区屏蔽、IP 日志记录和智能反垃圾保护，帮助网站管理员控制访问权限并增强站点安全性。 WordPress Proxy & VPN Blocker 3.5.8及之前版本存在跨站脚本漏洞，该漏洞源于输入中和不当，可能导致存储型跨站脚本攻击。

CVSS 7.1 · High EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
Proxy &amp; VPN Blocker Proxy &amp; VPN Blocker ≤ 3.5.8 affected
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I. Basic Information for CVE-2026-57399

Vulnerability Information
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Vulnerability Title
WordPress Proxy & VPN Blocker plugin <= 3.5.8 - 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 Proxy &amp; VPN Blocker Proxy &amp; VPN Blocker proxy-vpn-blocker allows Stored XSS.This issue affects Proxy &amp; VPN Blocker: from n/a through <= 3.5.8.
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
Vulnerability Title
WordPress Proxy & VPN Blocker 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Proxy & VPN Blocker是WordPress基金会的一款基于 proxycheck.io API 的 WordPress 安全插件，可实时检测并阻止 VPN、代理、Tor 节点等匿名流量，同时支持国家/地区屏蔽、IP 日志记录和智能反垃圾保护，帮助网站管理员控制访问权限并增强站点安全性。 WordPress Proxy & VPN Blocker 3.5.8及之前版本存在跨站脚本漏洞，该漏洞源于输入中和不当，可能导致存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Proxy &amp; VPN Blocker Proxy &amp; VPN Blocker 0 ~ 3.5.8 -

II. Public POCs for CVE-2026-57399

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III. Intelligence Information for CVE-2026-57399

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News Coverage for CVE-2026-57399 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-57399

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