CVE-2026-1303 MailChimp Campaigns <= 3.2.4 - Missing Authorization to Authenticated (Subscriber+) MailChimp App Disconnection
Authenticated subscribers can disconnect the MailChimp integration, disrupting email campaigns due to missing capability checks.
- 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-2026-1303?
CVE-2026-1303 is a medium-severity missing authorization vulnerability in matthieuscarset MailChimp Campaigns, published on 14 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The MailChimp Campaigns plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 3.2.4. This is due to missing capability checks on the `mailchimp_campaigns_manager_disconnect_app` function that is hooked to the AJAX action of the same name. This makes it possible for authenticated attackers, with Subscriber-level access and above, to disconnect the site from its MailChimp synchronization app, disrupting automated email campaigns and marketing integrations.
Weakness: CWE-862
Which versions are affected by CVE-2026-1303?
How do I fix CVE-2026-1303?
No fix has been published for CVE-2026-1303 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-1303 being exploited?
There is no known exploitation of CVE-2026-1303 in the wild and no public exploit code.
Sources
Also known as GHSA-4p4p-xgjx-qcc9.