CVE-2026-16268 Newsletters < 4.16 - Unauthenticated Server-Side Request Forgery via SNS Bounce Handler
Unauthenticated attackers can force the Newsletters WordPress plugin to fetch arbitrary URLs, enabling internal network access and potential data exposure.
- 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-2026-16268?
CVE-2026-16268 is a high-severity server-side request forgery vulnerability in Unknown Newsletters, published on 6 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 authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.
Weakness: CWE-918
Which versions are affected by CVE-2026-16268?
How do I fix CVE-2026-16268?
No fix has been published for CVE-2026-16268 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-16268 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16268 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-mhrm-79mh-vhfj.