FKIE_CVE-2026-6443

Vulnerability from fkie_nvd - Published: 2026-04-17 07:16 - Updated: 2026-06-17 11:00
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
All plugins by Essentialplugin for WordPress are vulnerable to an injected backdoor in various versions. This is due to the plugin being sold to a malicious threat actor that embedded a backdoor in all of the plugin's they acquired. This makes it possible for the threat actor to maintain a persistent backdoor and inject spam into the affected sites.
References
security@wordfence.comhttps://anchor.host/someone-bought-30-wordpress-plugins-and-planted-a-backdoor-in-all-of-them/
security@wordfence.comhttps://www.wordfence.com/threat-intel/vulnerabilities/id/2597724a-9a39-4e46-b153-f42366f833ba?source=cve
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Accordion and Accordion Slider",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.4.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Portfolio and Projects",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.5.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Featured Post Creative",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.5.7"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Post grid and filter ultimate",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.7.4"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP Featured Content and Slider",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.7.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Post Ticker Ultimate",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.7.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Trending/Popular Post Slider and Widget",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "1.8.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Meta Slider and Carousel with Lightbox",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.0.8"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Album and Image Gallery Plus Lightbox",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.1.8"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Timeline and History slider",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.4.5"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP Blog and Widgets",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Countdown Timer Ultimate",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.9"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Blog Designer \u2013 Post and Widget",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.7.7"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Team Slider and Team Grid Showcase plus Team Carousel",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.8.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Video gallery and Player",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.8.7"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Popup Maker and Popup Anything \u2013 Popup for opt-ins and Lead Generation Conversions",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "2.9.1"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Testimonial Grid and Testimonial Slider plus Carousel with Rotator Widget",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "3.5.6"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP Responsive Recent Post Slider/Carousel",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "3.7.1"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP Slick Slider and Image Carousel",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "3.7.8.1"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP Logo Showcase Responsive Slider and Carousel",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "3.8.7"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP responsive FAQ with category plugin",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "3.9.5"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "WP News and Scrolling Widgets",
          "vendor": "essentialplugin",
          "versions": [
            {
              "status": "affected",
              "version": "5.0.6"
            }
          ]
        }
      ],
      "source": "security@wordfence.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "All plugins by Essentialplugin for WordPress are vulnerable to an injected backdoor in various versions. This is due to the plugin being sold to a malicious threat actor that embedded a backdoor in all of the plugin\u0027s they acquired. This makes it possible for the threat actor to maintain a persistent backdoor and inject spam into the affected sites."
    }
  ],
  "id": "CVE-2026-6443",
  "lastModified": "2026-06-17T11:00:49.877",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security@wordfence.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-6443",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-17T18:49:32.019393Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-17T07:16:03.160",
  "references": [
    {
      "source": "security@wordfence.com",
      "url": "https://anchor.host/someone-bought-30-wordpress-plugins-and-planted-a-backdoor-in-all-of-them/"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/2597724a-9a39-4e46-b153-f42366f833ba?source=cve"
    }
  ],
  "sourceIdentifier": "security@wordfence.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-506"
        }
      ],
      "source": "security@wordfence.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.