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  4. CVE 2026 118166 mc4wp mailchimp for wordpress 4150
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Back to active CVEs
Medium · CVSS 4.8CVE-2026-118166

MC4WP: Mailchimp for WordPress < 4.15.0 - Unauthenticated Arbitrary Shortcode Execution via Dynamic Content TagCVE-2026-118166

Answer in brief

CVE-2026-118166 records a Medium severity (CVSS 4.8) vulnerability in MC4WP: Mailchimp for WordPress < 4.15.0 - Unauthenticated Arbitrary Shortcode Execution via Dynamic Content Tag. The current sources do not mark it as known exploited. The current feed maps Unknown/MC4WP: Mailchimp for WordPress (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/MC4WP: Mailchimp for WordPress (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Unknown/MC4WP: Mailchimp for WordPressgeneric>=0 <4.15.04.15.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Unknown/MC4WP: Mailchimp for WordPress.
  2. 2Review the reported fix. Update Unknown/MC4WP: Mailchimp for WordPress to 4.15.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • Source referencewpscan.com
Upstream source description

The MC4WP: Mailchimp for WordPress WordPress plugin before 4.15.0 does not prevent request-derived values in its dynamic content tags from being processed as shortcodes when a form is embedded with its block, allowing unauthenticated visitors to execute arbitrary registered shortcodes with attacker-chosen attributes. This requires the site owner to have added a request-derived tag to the form content and to embed the form with the block rather than the classic shortcode.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • MC4WP: Mailchimp for WordPress < 4.15.0 - Unauthenticated Subscription Audience OverrideSame unknown/mc4wp package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-74
Source
CVE List V5
Source checked
Nov 6, 2026
References
1 linked source
Open source record