Authenticated integration takeover via unchecked AJAX handlers
Published Aug 5, 2026 · Updated Aug 5, 2026
Missing authorization in Mailmunch Forms for Mailchimp 3.2.7 and earlier allows remote authenticated users to relink the integration. The sign_in() and sign_up() AJAX handlers accept attacker-supplied MailMunch credentials without checking a WordPress capability, allowing the integration account to be replaced. Subscriber-level access is sufficient; subsequent form submissions go to the attacker, while site forms and landing pages come from the attacker-controlled account.
Summary
What happened
Missing authorization in Mailmunch Forms for Mailchimp 3.2.7 and earlier allows remote authenticated users to relink the integration. The sign_in() and sign_up() AJAX handlers accept attacker-supplied MailMunch credentials without checking a WordPress capability, allowing the integration account to be replaced. Subscriber-level access is sufficient; subsequent form submissions go to the attacker, while site forms and landing pages come from the attacker-controlled account.
The record
- CVE
- CVE-2026-7520
- Published
- Aug 5, 2026
- Updated
- Aug 5, 2026
- Vendor
- Mailmunch
- Product
- Mailmunch Forms for Mailchimp
- Classifications
- CWE-862, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 5, 2026CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=3.2.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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