CVE-2026-9729 Cross-site scripting in Web Push Notifications – Webpushr
Authenticated contributors can inject arbitrary scripts via notification title and body parameters, 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-2026-9729?
CVE-2026-9729 is a medium-severity cross-site scripting vulnerability in Web Push Notifications – Webpushr, published on 23 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Webpushr Push Notifications plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'webpushr_notification_title' and 'webpushr_notification_body' parameters in versions up to, and including, 4.39.0. This is due to insufficient input sanitization in the save_send_notification_flag() function and missing output escaping in the wpp_notification_box() function, which concatenates raw post meta values directly into HTML attribute and textarea contexts. 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-2026-9729?
How do I fix CVE-2026-9729?
No fix has been published for CVE-2026-9729 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-2026-9729 being exploited?
There is no known exploitation of CVE-2026-9729 in the wild and no public exploit code.
Sources
Also known as GHSA-9vh2-928p-mm63.