Security Flaw in Newsletters WordPress Plugin Exposes Sites to Unauthorized Requests
CVE-2026-16268

8.2HIGH

Key Information:

Vendor

WordPress
Status
Newsletters
Vendor
CVE Published:
6 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16268?

The Newsletters WordPress plugin prior to version 4.16 is susceptible to a security vulnerability that fails to authenticate or validate bounce-processing requests. This oversight allows unauthenticated attackers to submit malicious user-supplied URLs, leading to arbitrary requests being executed on the server side. Consequently, this could potentially expose sensitive internal or external resources, compromising the integrity and confidentiality of the affected site.

Affected Version(s)

Newsletters 0 < 4.16

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-2026-16268 - Proof of Concept

References

https://wpscan.com/vulnerability/65612dd4-83d8-40c5-8e12-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
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

Yaswanth Reddy Sunkara
WPScan
.