CVE-2026-57399 HIGH

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

Vendor Proxy &Amp; Vpn Blocker
Product Proxy &amp; VPN Blocker
Weakness CWE-79 · XSS
Published July 13, 2026
Last update July 13, 2026

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

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.

Explanation of Vulnerability in Simple Terms

02Summary

Proxy & VPN Blocker versions 3.5.8 and earlier contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into web pages viewed by site visitors. The vulnerability requires user interaction—a victim must visit a crafted link or page. The impact extends beyond the vulnerable component, potentially affecting other parts of the site or user sessions.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that execute in visitors' browsers, stealing session data or performing actions on their behalf.

Potential impact on your site

04Site Impact

Visitors' browsers can be compromised; attackers may steal credentials, deface content, or redirect users to malicious sites.

Conditions required to exploit

05Prerequisites

No authentication required. Victim must click a malicious link or visit a crafted page.

Key dates

06Disclosure timeline

July 13, 2026 CVE published
July 13, 2026 Record updated

Related vulnerabilities

08Related CVE