CVE-2026-16269 Newsletters < 4.16 - Unauthenticated API Authentication Bypass via Type Juggling
Unauthenticated attackers can bypass API authentication via type juggling to modify subscriber records and send emails if the optional API is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16269?
CVE-2026-16269 is a medium-severity authentication bypass vulnerability in Unknown Newsletters, published on 8 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-16269?
How do I fix CVE-2026-16269?
No fix has been published for CVE-2026-16269 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-16269 being exploited?
There is no known exploitation of CVE-2026-16269 in the wild and no public exploit code.
Sources
Also known as GHSA-5mfh-c59g-8688.