CVE-2026-90981 Newsletter <= 9.3.8 - Reflected Cross-Site Scripting via 'nn' Parameter
Unauthenticated attackers can inject scripts via the 'nn' parameter, potentially compromising logged-in administrator accounts in the Newsletter WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-90981?
CVE-2026-90981 is a medium-severity cross-site scripting vulnerability in satollo Newsletter – Send awesome emails from WordPress, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'nn' parameter in all versions up to, and including, 9.3.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Successful exploitation requires the victim to be a logged-in administrator, as the antibot check auto-passes for authenticated users, routing the unsanitized payload through the administrator-visible output branch of dienow().
Weakness: CWE-79
Which versions are affected by CVE-2026-90981?
How do I fix CVE-2026-90981?
No fix has been published for CVE-2026-90981 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-90981 being exploited?
There is no known exploitation of CVE-2026-90981 in the wild and no public exploit code.
Sources
Also known as GHSA-wfxw-m2wq-7ph8.