CVE-2026-17520— Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key
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.
Newsletters WordPress 插件在 4.17 版本之前存在以下安全漏洞：该插件未使用足够随机的源来生成 API 密钥，而是基于一个公开已知的值推导密钥。因此，当可选的 API 功能被启用时，未认证的攻击者可以计算出该密钥，并执行具有权限的操作，例如添加和删除订阅者以及发送邮件。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Unknown | Newsletters | < 4.17 |
affected |
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I. Basic Information for CVE-2026-17520
Vulnerability Information
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Vulnerability Title
Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key
Source: CVE Program / CVE List V5
Vulnerability Description
The Newsletters WordPress plugin before 4.17 does not generate its API key using a sufficiently random source, deriving it from a publicly known value, allowing unauthenticated attackers to compute the key and perform privileged actions such as adding and deleting subscribers 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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Unknown | Newsletters | 0 ~ 4.17 | - |
|
II. Public POCs for CVE-2026-17520
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Security Blog Posts for CVE-2026-17520 (1)
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🔗 Newsletters < 4.17 – Unauthenticated API Access via Predictable API Key | CVE 2026-17520 | Plugin Vulnerabilities exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-08-29 · 26 CVEs total
| CVE-2026-77007 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated BigBlueButto | |
| CVE-2026-81200 | MasterStudy LMS < 3.7.42 - Instructor+ Cross-Tenant Order Billing PII Disclosure via IDOR | |
| CVE-2026-81342 | MasterStudy LMS < 3.7.43 - Unauthenticated Open Redirect | |
| CVE-2026-81346 | Frontend Admin by DynamiApps < 3.29.11 - Subscriber+ Arbitrary Membership Plan Deletion | |
| CVE-2026-81026 | MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN | |
| CVE-2026-80311 | Stripe Payment Forms by WP Full Pay < 8.5.5 - Cross-Customer Subscription Cancellation via | |
| CVE-2026-80488 | WP Ultimate CSV Importer < 9.0 - Admin+ SQLi via AIOSEO Import Fields | |
| CVE-2026-77704 | Amelia 1.2.32 - 2.4.8 - Amelia Customer+ Appointment Status Update and Self-Approval | |
| CVE-2026-77786 | Rank Math SEO < 1.0.277 - Editor+ Core Settings Modification via fix-site-seo Ability | |
| CVE-2026-76586 | BookingPress 1.5.6 - 1.6.2 - Unauthenticated Booking Price Manipulation via PayPal Payment | |
| CVE-2026-77010 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated Moderator Jo | |
| CVE-2026-77012 | Icollect <= 1.0.0 - Unauthenticated Arbitrary File Read, SSRF and Path Traversal File Writ | |
| CVE-2026-77008 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated Plugin Setti | |
| CVE-2026-16259 | Uix UserCenter <= 1.0.3 - Unauthenticated Privilege Escalation | |
| CVE-2026-76547 | Profile Builder < 4.0.1 - Admin+ PHP Object Injection via Import/Export | |
| CVE-2026-76548 | Profile Builder < 4.0.1 - Unauthenticated Unpublished Content and Media Modification via F | |
| CVE-2026-17522 | Newsletters < 4.17 - Arbitrary Plugin Option Update via CSRF | |
| CVE-2026-76546 | Profile Builder < 4.0.1 - Contributor+ Stored XSS via Format Date Shortcode | |
| CVE-2026-19430 | CatFolders Document Gallery Pro < 2.0.7 - Unauthenticated Missing Authorization via downlo | |
| CVE-2026-18234 | MStore API < 4.21.1 - Subscriber+ Arbitrary Order Payment Bypass via Wallet |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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CVE-2026-16267
Newsletters < 4.16 - Unauthenticated PHP Object Injection vi
Same vendor: Unknown
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V. Comments for CVE-2026-17520
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