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CVE-2026-7520— MailChimp Forms by MailMunch <= 3.2.7 - Missing Authorization to Authenticated (Subscriber+) MailMunch Integration Takeover via 'sign_in' AJAX Action

Quick assessment

Affected
mailmunch Mailmunch Forms for Mailchimp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Mailmunch Forms for Mailchimp是WordPress基金会开源的一款创建表单并集成邮件营销服务的CMS插件。 WordPress Mailmunch Forms for Mailchimp 3.2.7及之前版本存在授权问题漏洞，该漏洞源于对sign_in()和sign_up() AJAX处理器缺少能力检查，可能导致已认证攻击者（具有订阅者级别及以上权限）重新链接MailMunch集成到攻击者控制的账户，导致订阅者数据泄露和网站表单内容被攻击者控制。

CVSS 8.1 · High EPSS 0.49% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
mailmunch Mailmunch Forms for Mailchimp ≤ 3.2.7 affected
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I. Basic Information for CVE-2026-7520

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
MailChimp Forms by MailMunch <= 3.2.7 - Missing Authorization to Authenticated (Subscriber+) MailMunch Integration Takeover via 'sign_in' AJAX Action
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Mailmunch Forms for Mailchimp 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Mailmunch Forms for Mailchimp是WordPress基金会开源的一款创建表单并集成邮件营销服务的CMS插件。 WordPress Mailmunch Forms for Mailchimp 3.2.7及之前版本存在授权问题漏洞，该漏洞源于对sign_in()和sign_up() AJAX处理器缺少能力检查，可能导致已认证攻击者（具有订阅者级别及以上权限）重新链接MailMunch集成到攻击者控制的账户，导致订阅者数据泄露和网站表单内容被攻击者控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mailmunch Mailmunch Forms for Mailchimp 0 ~ 3.2.7 -

II. Public POCs for CVE-2026-7520

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III. Intelligence Information for CVE-2026-7520

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Patches & Fixes for CVE-2026-7520 (3)

Vendor Advisories for CVE-2026-7520 (1)

IV. Related Vulnerabilities

Same vendor: mailmunch
Same weakness: CWE-862

V. Comments for CVE-2026-7520

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