Unauthorized list changes via missing nonce validation
Published Feb 19, 2026 · Updated Feb 19, 2026
Cross-site request forgery in Mailchimp List Subscribe Form 2.0.0 and earlier allows remote attackers to change Mailchimp lists. The mailchimp_sf_change_list_if_necessary() function processes list-change requests without correctly validating a WordPress nonce, so forged requests are accepted in an administrator's authenticated session. Exploitation requires a site administrator to interact with attacker-controlled content, such as a crafted link; the bounded consequence is an unauthorized Mailchimp list change.
Summary
What happened
Cross-site request forgery in Mailchimp List Subscribe Form 2.0.0 and earlier allows remote attackers to change Mailchimp lists. The mailchimp_sf_change_list_if_necessary() function processes list-change requests without correctly validating a WordPress nonce, so forged requests are accepted in an administrator's authenticated session. Exploitation requires a site administrator to interact with attacker-controlled content, such as a crafted link; the bounded consequence is an unauthorized Mailchimp list change.
The record
- CVE
- CVE-2025-12172
- Published
- Feb 19, 2026
- Updated
- Feb 19, 2026
- Vendor
- Mailchimp
- Product
- Mailchimp List Subscribe Form
- Classifications
- CWE-352, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 19, 2026CVE publishedPublication date reported by the CVE source.
- Feb 19, 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?
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- Affected versionversion=* <=2.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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