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CVE-2026-16603— Content Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST API

Quick assessment

Affected
Unknown Passster
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 passster是WordPress基金会开源的一款内容密码保护插件。 WordPress passster 4.3.6之前版本存在安全漏洞，该漏洞源于未在WordPress REST API上实施基于类别的内容保护，可能导致未经身份验证的用户通过核心REST API读取分类锁定文章的完整内容、标题和摘要。

AI Predicted 7.5 Difficulty: Trivial EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Passster < 4.3.6 affected
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I. Basic Information for CVE-2026-16603

Vulnerability Information
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Vulnerability Title
Content Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST API
Source: CVE Program / CVE List V5
Vulnerability Description
The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress passster 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress passster是WordPress基金会开源的一款内容密码保护插件。 WordPress passster 4.3.6之前版本存在安全漏洞，该漏洞源于未在WordPress REST API上实施基于类别的内容保护，可能导致未经身份验证的用户通过核心REST API读取分类锁定文章的完整内容、标题和摘要。
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
Unknown Passster 0 ~ 4.3.6 -

II. Public POCs for CVE-2026-16603

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III. Intelligence Information for CVE-2026-16603

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Vendor Advisories for CVE-2026-16603 (1)

Same Patch Batch · Unknown · 2026-08-05 · 24 CVEs total

CVE-2026-16993 DHL for WooCommerce < 4.0.1 - Unauthenticated Shipping Label Disclosure via Unprotected Up
CVE-2026-17515 MLS Import < 7.0.4 - Subscriber+ Sensitive Information Disclosure via mlsimport_logger_per
CVE-2026-16036 miniOrange 2FA < 6.2.7 - 2FA Bypass via Password-Only Second-Factor Rebinding
CVE-2026-16055 Contest Gallery < 30.0.7 - Unauthenticated Login-Protection and 2FA Bypass via post_cg_log
CVE-2025-15677 GeoDirectory < 2.8.110 - Editor+ Stored XSS via Place Categories
CVE-2026-14553 Zportals < 6.3.4 - Subscriber+ Arbitrary File Upload
CVE-2026-15210 Login/Signup with Phone Number, OTP Verification < 1.8.71 - Unauthenticated Account Takeov
CVE-2026-15230 YayPricing < 3.5.7 - Subscriber+ Pricing Configuration Modification and Coupon Code Disclo
CVE-2026-15372 WP 2FA < 4.1.0 - Two-Factor Authentication Bypass via Passkeys Provider
CVE-2026-15360 Ajax Load More < 8.0.1 - Unauthenticated SQL Injection via custom_args
CVE-2026-16940 Custom Fields for WooCommerce < 1.5.1 - Unauthenticated Arbitrary File Deletion via Path T
CVE-2026-16981 DHL for WooCommerce < 4.0.1 - Unauthenticated Shipping Label Download via IDOR
CVE-2026-16561 Sunshine Photo Cart < 3.6.12 - Unauthenticated Private Gallery Comment Disclosure
CVE-2026-16968 GeoDirectory < 2.8.168 - Contributor+ User Email Disclosure via geodir_json_search_users
CVE-2026-16942 WP Custom HTML Pages <= 0.6.2 - Author+ Stored XSS
CVE-2026-16736 User Registration & Membership < 5.2.6 - Unauthenticated Account Creation While Registrati
CVE-2026-16613 GDPR Cookie Compliance < 5.1.0 - Cookie Deletion and Forced Logout via CSRF
CVE-2026-16604 Content Protector (Passster) < 4.3.6 - Unauthenticated Protected Content Disclosure via Co
CVE-2026-16746 MultiVendorX < 5.0.11 - Store Owner+ Cross-Store Commission Data Disclosure via commission
CVE-2026-16605 MultiVendorX < 5.0.11 - Store Owner+ Cross-Vendor Store Takeover and Deletion via Missing

Showing top 20 of 24 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Passster
Same vendor: Unknown

V. Comments for CVE-2026-16603

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