CVE-2026-17559
Content Protector (Passster) < 4.3.9 - Unauthenticated Protected Content Disclosure via REST Path Allowlist Bypass
Description
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.
INFO
Published Date :
Aug. 21, 2026, 12:16 p.m.
Last Modified :
Oct. 16, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update the Passster WordPress plugin to version 4.3.9.
- Verify plugin access controls are correctly configured.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-17559.
| URL | Resource |
|---|---|
| https://wpscan.com/vulnerability/28a48c1c-e162-4e8a-b450-5568fb3a3fc8/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-17559 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-17559
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-17559 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-17559 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 16, 2026
Action Type Old Value New Value Changed Translation Title: Passster, Description: El plugin de WordPress Passster anterior a la versión 4.3.9 no coincide correctamente con sus propias rutas de endpoint público al decidir qué solicitudes de la API REST pueden eludir la protección global por contraseña, comparándolas como una subcadena no anclada de la URI de la solicitud en lugar de contra la ruta resuelta, lo que permite a un atacante no autenticado leer el contenido de publicaciones y páginas protegidas globalmente por contraseña. Title: Passster, Description: El plugin de WordPress Passster anterior a la versión 4.3.9 no coincide correctamente con sus propias rutas de endpoint público al decidir qué solicitudes de la API REST pueden eludir la protección global por contraseña, comparándolas como una subcadena no anclada de la URI de la solicitud en lugar de contra la ruta resuelta, lo que permite a un atacante no autenticado leer el contenido de publicaciones y páginas protegidas globalmente por contraseña. -
CVE Translated by [email protected]
Oct. 16, 2026
Action Type Old Value New Value Added Translation Title: Passster, Description: El plugin de WordPress Passster anterior a la versión 4.3.9 no coincide correctamente con sus propias rutas de endpoint público al decidir qué solicitudes de la API REST pueden eludir la protección global por contraseña, comparándolas como una subcadena no anclada de la URI de la solicitud en lugar de contra la ruta resuelta, lo que permite a un atacante no autenticado leer el contenido de publicaciones y páginas protegidas globalmente por contraseña. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 21, 2026
Action Type Old Value New Value Added CWE CWE-863 Added SSVC {'id': 'CVE-2026-17559', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-21T12:47:08.377343Z'} -
New CVE Received by [email protected]
Aug. 21, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Unknown', 'product': 'Passster', 'versions': [{'status': 'affected', 'version': '4.3.3', 'lessThan': '4.3.9', 'versionType': 'semver'}], 'collectionURL': 'https://wordpress.org/plugins', 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added Reference https://wpscan.com/vulnerability/28a48c1c-e162-4e8a-b450-5568fb3a3fc8/