Newsletters < 4.17 - Insufficient Authorization

5.3
Generation of Predictable Numbers or Identifiers
CVE CVE-2026-17520
CVSS 5.3 (Medium)
Publicly Published August 27, 2026
Last Updated September 2, 2026
Researcher Erwan LR - WPScan

Description

The Newsletters plugin for WordPress is vulnerable to unauthorized access due to insufficient randomization of API keys in all versions up to 4.17 (exclusive). This makes it possible for unauthenticated attackers to access API routes through brute force.

References

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Vulnerability Details for Newsletters

Software Type Plugin
Software Slug newsletters-lite (view on wordpress.org)
Patched? Yes
Remediation Update to version 4.17, or a newer patched version
Affected Version
  • < 4.17
Patched Version
  • 4.17

Recent vulnerabilities in Newsletters

# Title CVE ID CVSS Researchers Date
1 Newsletters <= 4.18.0 - Unauthenticated Insecure Direct Object Reference CVE-2026-16264 5.3 Yaswanth Reddy Sunkara September 21, 2026
2 Newsletters <= 4.18 - Authenticated (Administrator+) SQL Injection CVE-2026-66619 4.9 Ananda Dhakal September 17, 2026
3 Newsletters < 4.17 - Cross-Site Request Forgery CVE-2026-17522 4.3 Erwan LR August 29, 2026
4 Newsletters <= 4.17 - Missing Authorization to Authenticated (Author+) Arbitrary Modification via 'newsletters_mailinglistsroles' POST Parameter CVE-2026-75908 4.3 Wordfence PRISM August 24, 2026
5 Newsletters <= 4.15 - Unauthenticated API Authorization Bypass via Type Juggling CVE-2026-16269 7.3 Haitam Lazaar August 3, 2026
6 Newsletters <= 4.15 - Unauthenticated PHP Object Injection CVE-2026-16267 8.1 Sai Praneeth Koti August 3, 2026
7 Newsletters <= 4.15 - Unauthenticated Server-Side Request Forgery CVE-2026-16268 7.2 Yaswanth Reddy Sunkara July 30, 2026
8 Newsletters <= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link' Shortcode Attribute CVE-2026-12939 6.4 Wordfence PRISM July 28, 2026
9 Newsletters <= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'target' Shortcode Attribute CVE-2026-12938 6.4 Wordfence PRISM July 28, 2026
10 Newsletters <= 4.14 - Unauthenticated Stored Cross-Site Scripting CVE-2026-57394 7.2 dutafi July 8, 2026

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