---
id: CVE-2026-17559
title: >-
  The Passster WordPress plugin before 4.3.9 does not correctly match its own
  public endpoint paths when deciding which REST API requests may bypass global
  password protection, comparing them as an unanchored substring of the request
  URI r…
summary: >-
  The Passster WordPress plugin before 4.3.9 does not correctly match its own
  public endpoint paths when deciding which REST API requests may bypass global
  password protection, comparing them as an unanchored substring of the request
  URI r…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-863
published: '2026-08-21'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:10:00.103'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-17559'
references:
  - url: 'https://wpscan.com/vulnerability/28a48c1c-e162-4e8a-b450-5568fb3a3fc8/'
    label: contact@wpscan.com
tags:
  - nvd
epss: 0.0035
epssPercentile: 0.28824
ingestedAt: '2026-10-27T18:52:09.913Z'
---

## Overview

The Passster WordPress plugin before 4.3.9 does not correctly match its own public endpoint paths when deciding which REST API requests may bypass global password protection, comparing them as an unanchored substring of the request URI rather than against the resolved route, allowing an unauthenticated attacker to read the content of globally password-protected posts and pages.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.