MailChimp Forms by MailMunch <= 3.1.4 - Missing Authorization via multiple AJAX actions
Strategic Overview
- Status
- Patched in 3.1.5
- Affected Plugin
- Mailmunch Forms for Mailchimp
- Affected Version
<= 3.1.4- CVSS
- 5.4Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2023-40203
At a glance
CVE-2023-40203 is a medium-severity Missing Authorization vulnerability in the Mailmunch Forms for Mailchimp WordPress plugin, affecting versions <= 3.1.4. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The root cause is a missing authorization check on a reachable function. The issue is fixed in version 3.1.5; sites on affected versions should update now. Disclosed August 2023, reported by István Márton.
Vulnerability Overview
The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to unauthorized modification of data and loss of data due to a missing capability check on the 'delete_widget', 'change_email_status', and 'delete_email' AJAX functions in versions up to, and including, 3.1.4. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete widgets and change or delete arbitrary email subscriber records.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-862: Missing Authorization
Mailmunch Forms for Mailchimp <= 3.1.4 carries this weakness at delete_widget, and reaching it takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Mailmunch Forms for Mailchimp the fix is 3.1.5: builds <= 3.1.4 are affected, anything from 3.1.5 onward is not.
Remediation
Update to version 3.1.5, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Mailmunch Forms for Mailchimp 3.1.5 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Mailmunch Forms for Mailchimp
- 6.4CVE-2024-29793: MailChimp Forms by MailMunch <= 3.2.2 Stored XSS
CVE-2024-29793 - 6.1CVE-2024-8726: MailChimp Forms by MailMunch <= 3.2.3 Reflected XSS
CVE-2024-8726 - 5.4CVE-2023-45748: MailChimp Forms by MailMunch <= 3.1.7 CSRF
CVE-2023-45748 - 4.3CVE-2024-31378: MailChimp Forms by MailMunch <= 3.2.1 CSRF
CVE-2024-31378
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