CVE Explorer

CVE-2026-1781

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 4.11.1. This is due to the plugin trusting the `_mc4wp_action` POST parameter without validation, allowing unauthenticated attackers to force the form to process unsubscribe actions instead of subscribe actions. This makes it possible for unauthenticated attackers to arbitrarily unsubscribe any email address from the connected Mailchimp audience via the `_mc4wp_act

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f0fa81241afb851a471b9efd7689a0c50acca9d0db4f7edfdf270713e5c4c92a

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"MC4WP: Mailchimp for WordPress","vendor":"dvankooten","versions":[{"lessThanOrEqual":"4.11.1","status":"affected","version":"0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"baseScore":6.5,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-862","description":"CWE-862 Missing Authorization","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions

{"url":"https://cwe.mitre.org/data/definitions/862.html"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/4

{"url":"https://github.com/ibericode/mailchimp-for-wordpress/commit/5fdebc2a5e22d11287d011697a6b09331bd96fa5"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/5

{"url":"https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/tags/4.11.1/includes/forms/class-form-listener.php#L207"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/2

{"url":"https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/tags/4.11.1/includes/forms/class-form-listener.php#L53"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/1

{"url":"https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/tags/4.11.1/includes/forms/class-form.php#L461"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/3

{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3477825%40mailchimp-for-wp%2Ftrunk&old=3443118%40mailchimp-for-wp%2Ftrunk&sfp_email=&sfph_mail="}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/6

{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/10262aa9-5656-4a2b-aeb5-060018798369?source=cve"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:62cdf768cd1f406a2a68e523acc66f0323beea91d38da3bfb56e2473e63c94a4 · sha256:68642959048a1dd3… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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