CVE-2026-15000 Cross-site scripting in Connect Contact Form 7 and Mailchimp
Unauthenticated attackers can inject scripts via Mailchimp fields that execute when administrators view contact entries, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15000?
CVE-2026-15000 is a high-severity cross-site scripting vulnerability in rnzo Connect Contact Form 7 and Mailchimp, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Connect Contact Form 7 and Mailchimp plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Mailchimp Merge Field Values in all versions up to, and including, 0.9.78.06 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is only triggered when a privileged user (Administrator) performs a Contact Lookup for the email address submitted via the CF7 form, meaning execution is deferred until an administrator interacts with the affected entry.
Weakness: CWE-79
Which versions are affected by CVE-2026-15000?
How do I fix CVE-2026-15000?
No fix has been published for CVE-2026-15000 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-2026-15000 being exploited?
There is no known exploitation of CVE-2026-15000 in the wild and no public exploit code.
Sources
Also known as GHSA-6h77-cm5j-f2x9.