CVE-2026-1399 WP Google Ad Manager Plugin <= 1.1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via Admin Settings
Administrators can inject scripts via settings in multi-site or restricted HTML environments, leading to stored XSS execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1399?
CVE-2026-1399 is a medium-severity cross-site scripting vulnerability in miles99 WP Google Ad Manager Plugin, published on 28 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The WP Google Ad Manager Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 1.1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Weakness: CWE-79
Which versions are affected by CVE-2026-1399?
How do I fix CVE-2026-1399?
No fix has been published for CVE-2026-1399 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-2026-1399 being exploited?
There is no known exploitation of CVE-2026-1399 in the wild and no public exploit code.
Sources
Also known as GHSA-gmxm-wmfm-4gvg.