CVE-2025-9856 Cross-site scripting in Popup Builder – Create highly converting, mobile friendly marketing popups.
Authenticated attackers with contributor access can inject arbitrary scripts via the sg_popup shortcode, leading to stored XSS execution on victim pages.
- 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-2025-9856?
CVE-2025-9856 is a medium-severity cross-site scripting vulnerability in popupbuilder Popup Builder – Create highly converting, mobile friendly marketing popups., published on 13 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'sg_popup' shortcode in all versions up to, and including, 4.4.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-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-2025-9856?
How do I fix CVE-2025-9856?
No fix has been published for CVE-2025-9856 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-2025-9856 being exploited?
There is no known exploitation of CVE-2025-9856 in the wild and no public exploit code.
Sources
Also known as GHSA-x73c-vmj2-65g5.