CVE-2026-17559

Content Protector (Passster) < 4.3.9 - Unauthenticated Protected Content Disclosure via REST Path Allowlist Bypass

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.

We have discovered 2,144 live websites that are affected by CVE-2026-17559.

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Affected Software

Product  Content Protector
Category Wordpress Plugins
Vulnerable Domains2,144 live websites (59% of Content Protector install base)
Vulnerable Versions
  • from 4.3.3 through 4.3.9
Vulnerable Versions Count6 versions ( 11% of all versions)


Common Weakness Enumeration

CWE-863 Incorrect Authorization



Details

  • Published - Aug 21, 2026
  • Updated - Aug 21, 2026

Credits

  • Erwan LR (WPScan) (finder)
  • WPScan (coordinator)

Website Distribution by Country

Number of websites using CVE-2026-17559
United States717 websites


Germany352 websites
GB152 websites
Japan138 websites
France123 websites
Canada74 websites
Netherlands69 websites
Switzerland50 websites
Italy38 websites
Denmark35 websites

Website Distribution by TLD

Number of websites using CVE-2026-17559
.com829 websites
.de264 websites
.org231 websites
.fr67 websites
.co.uk64 websites
.net56 websites
.nl54 websites
.ca42 websites
.ch39 websites
.jp31 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-17559

Top websites that are affected by CVE-2026-17559. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
****.com United States***
************.com United States**,***
**************.com United States**,***
****.***.za South Africa**,***
*********.com United States**,***
*************.com United States**,***
******.org United States**,***
*******.com United States***,***
*************.com United States***,***
*****.**.gov United States***,***
See full domain list

FAQ

CVE-2026-17559 is Incorrect Authorization in Content Protector
A total of 2,144 websites have been identified as vulnerable to CVE-2026-17559, based on global website indexing conducted by WebTechSurvey.
The Content Protector is affected by the CVE-2026-17559 vulnerability.
Content Protector versions up to 4.3.9 are vulnerable to CVE-2026-17559.
CVE-2026-17559 is resolved in version 4.3.9 of Content Protector.