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CVE-2026-16269— Newsletters < 4.16 - Unauthenticated API Authentication Bypass via Type Juggling

Quick assessment

Affected
Unknown Newsletters
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 Newsletters是WordPress基金会的一款新闻通讯管理工具。 WordPress Newsletters 4.16之前版本存在安全漏洞，该漏洞源于未严格比较API身份验证密钥，允许未经身份验证的攻击者通过类型混淆绕过API身份验证，并执行修改订阅者记录和发送电子邮件等特权操作。

AI Predicted 8.1 Difficulty: Easy EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Newsletters < 4.16 affected
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I. Basic Information for CVE-2026-16269

Vulnerability Information
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Vulnerability Title
Newsletters < 4.16 - Unauthenticated API Authentication Bypass via Type Juggling
Source: CVE Program / CVE List V5
Vulnerability Description
The Newsletters WordPress plugin before 4.16 does not strictly compare its API authentication key, allowing unauthenticated attackers to bypass the API authentication via type juggling and perform privileged actions such as modifying subscriber records and sending emails, when the optional API has been enabled.
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 Newsletters 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Newsletters是WordPress基金会的一款新闻通讯管理工具。 WordPress Newsletters 4.16之前版本存在安全漏洞，该漏洞源于未严格比较API身份验证密钥，允许未经身份验证的攻击者通过类型混淆绕过API身份验证，并执行修改订阅者记录和发送电子邮件等特权操作。
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 Newsletters 0 ~ 4.16 -

II. Public POCs for CVE-2026-16269

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III. Intelligence Information for CVE-2026-16269

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Vendor Advisories for CVE-2026-16269 (1)

Same Patch Batch · Unknown · 2026-08-08 · 17 CVEs total

CVE-2026-16955 AI Engine < 3.6.6 - Subscriber+ Arbitrary File Read via Audio Transcription
CVE-2026-16953 AI Engine < 3.6.4 - Unauthenticated Cross-Session Chatbot File Deletion via Forgeable Sess
CVE-2026-16595 WP Directory Kit < 1.5.5 - Subscriber+ User and Unpublished Listing Disclosure
CVE-2026-16608 Download Monitor < 5.2.6 - Unauthenticated Download Log Injection
CVE-2026-16948 Solace Extra < 1.6.1 - Subscriber+ Multiple Missing Authorization via Site-Wide Nonce Expo
CVE-2026-16594 WP Directory Kit < 1.5.5 - Subscriber+ Plugin Settings and API Key Disclosure
CVE-2026-16590 WP Directory Kit < 1.5.5 - Subscriber+ Contact Message and User Data Disclosure
CVE-2026-16578 Admin Safety Guard < 1.4.0 - Unauthenticated User Data Disclosure via 2fa/app/users REST R
CVE-2026-16574 Dokan < 5.0.11 - Vendor+ Cross-Vendor Downloadable Product Access Grant via Order Download
CVE-2026-16562 WP Statistics < 14.16.10 - Subscriber+ Sensitive Data Disclosure via Metabox AJAX Handlers
CVE-2026-16589 WP Directory Kit < 1.5.5 - Subscriber+ SQL Injection via data_fields_list Parameter
CVE-2026-16535 Link Library < 7.9.4 - Reflected XSS via Thumbs-Rating likelabel
CVE-2026-16282 Appointment Hour Booking < 1.5.88 - Unauthenticated Booking Price Manipulation via tcost P
CVE-2026-16558 YMC Filter < 3.12.8 - Contributor+ Stored XSS via Layout Builder Schema
CVE-2026-16559 YMC Filter < 3.12.9 - Author+ Stored XSS via SVG Icon Upload
CVE-2026-16267 Newsletters < 4.16 - Unauthenticated PHP Object Injection via Date Form Field

IV. Related Vulnerabilities

Same product: Newsletters
Same vendor: Unknown

V. Comments for CVE-2026-16269

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