CVE-2026-16269

Newsletters < 4.16 - Unauthenticated API Authentication Bypass via Type Juggling

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

Newsletters

CVSS v3.1 CNA

4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS

0.36% chance of exploitation in the next 30 days, 29th percentile

Published

2026-08-08

Updated

2026-08-11

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/8b09afba-16a5-4d6c-9e85-84433a3c0d66/

References

• CVE Record
• NVD entry