CVE-2026-17520 Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key
Unauthenticated attackers can predict the API key to perform privileged actions like managing subscribers and sending 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-2026-17520?
CVE-2026-17520 is a medium-severity vulnerability in Unknown Newsletters, published on 29 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 4.17 does not generate its API key using a sufficiently random source, deriving it from a publicly known value, allowing unauthenticated attackers to compute the key and perform privileged actions such as adding and deleting subscribers and sending emails, when the optional API has been enabled.
Weakness: CWE-326
Which versions are affected by CVE-2026-17520?
How do I fix CVE-2026-17520?
No fix has been published for CVE-2026-17520 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-17520 being exploited?
There is no known exploitation of CVE-2026-17520 in the wild and no public exploit code.
Sources
Also known as GHSA-jf3w-mh76-5398.