CVE-2026-109989 Themify Popup <= 1.4.7 - Authenticated (Author+) Stored Cross-Site Scripting via 'popup_width_unit' Parameter
Authenticated attackers with author-level access can inject arbitrary scripts via the popup_width_unit parameter, leading to stored XSS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109989?
CVE-2026-109989 is a medium-severity cross-site scripting vulnerability in themifyme Themify Popup, published on 17 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Themify Popup plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'popup_width_unit' parameter in all versions up to, and including, 1.4.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-109989?
How do I fix CVE-2026-109989?
No fix has been published for CVE-2026-109989 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-2026-109989 being exploited?
There is no known exploitation of CVE-2026-109989 in the wild and no public exploit code.
Sources
Also known as GHSA-5jfw-8m7v-h73m.