CVE-2026-7520 Missing authorization in Mailmunch Forms for Mailchimp
Authenticated subscribers can hijack MailMunch integration to steal subscriber data and control site forms due to missing capability checks.
- 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-2026-7520?
CVE-2026-7520 is a high-severity missing authorization vulnerability in Mailmunch Forms for Mailchimp, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `sign_in()` and `sign_up()` AJAX handlers in all versions up to, and including, 3.2.7. This makes it possible for authenticated attackers, with Subscriber-level access and above, to relink the site's MailMunch integration to an attacker-controlled MailMunch account by submitting attacker-supplied credentials. Once relinked, all subscriber data captured by the plugin's forms is delivered to the attacker, and the forms/landing pages rendered on the site are pulled from the attacker's MailMunch account.
Weakness: CWE-862
Which versions are affected by CVE-2026-7520?
How do I fix CVE-2026-7520?
No fix has been published for CVE-2026-7520 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-2026-7520 being exploited?
There is no known exploitation of CVE-2026-7520 in the wild and no public exploit code.
Sources
Also known as GHSA-49m8-524g-8rr2.