CVE-2026-16269: Unknown Newsletters

Medium severity, CVSS 4.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Unknown Newsletters: before 4.16 (fixed in 4.16)

Published 2026-08-08. Last modified 2026-08-26.