Improper Redirection in Newsletter WordPress Plugin
CVE-2026-86823

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Newsletter
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86823?

The Newsletter WordPress plugin prior to version 9.3.7 has a security flaw due to insufficient validation of redirect destinations following public subscription actions. This vulnerability enables unauthenticated attackers to manipulate redirects, potentially leading users to malicious external sites. Additionally, it exposes subscriber tokens that could be exploited to perform unauthorized actions on the subscriber’s behalf, compromising user data and privacy.

Affected Version(s)

Newsletter 0 < 9.3.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-86823 - Proof of Concept

References

https://wpscan.com/vulnerability/2db98679-24ca-494e-a8fd-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Artus KG
WPScan
.