CVE-2026-118166

Full vulnerability record from the local CVENow database.

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.

Severity

MEDIUM

CVSS score

4.8 (v3.1)

Vulnerability status

Received

Source identifier

[email protected]

Published

2026-11-06 08:17:18.400000

Last modified

2026-11-06 08:17:18.400000

View original CVE JSON

{
  "id": "CVE-2026-118166",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-06T08:17:18.400",
  "lastModified": "2026-11-06T08:17:18.400",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Unknown",
          "product": "MC4WP: Mailchimp for WordPress",
          "defaultStatus": "unaffected",
          "collectionURL": "https://wordpress.org/plugins",
          "versions": [
            {
              "version": "0",
              "lessThan": "4.15.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 4.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 2.5
      }
    ]
  },
  "references": [
    {
      "url": "https://wpscan.com/vulnerability/a8b2a564-25ae-4ed8-9c2c-989b104ba4c8/",
      "source": "[email protected]"
    }
  ]
}