CVE-2026-16264 Newsletters < 4.18.1 - Unauthenticated Subscriber Record Overwrite and PII Disclosure via IDOR
Unauthenticated attackers can read and overwrite subscriber records, exposing PII and modifying email addresses due to missing ownership checks.
- 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-2026-16264?
CVE-2026-16264 is a medium-severity missing authorization vulnerability in Unknown Newsletters, published on 23 Sep 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 4.18.1 does not perform an ownership check on some of its subscriber management actions, and issues a management session to unauthenticated visitors on request, allowing attackers to read any subscriber's personal data and overwrite any subscriber's record including their email address.
Weakness: CWE-639
Which versions are affected by CVE-2026-16264?
How do I fix CVE-2026-16264?
No fix has been published for CVE-2026-16264 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-16264 being exploited?
There is no known exploitation of CVE-2026-16264 in the wild and no public exploit code.
Sources
Also known as GHSA-q3j5-fxpp-r5pf.