CVE-2026-96256 (GCVE-0-2026-96256)

Vulnerability from cvelistv5 – Published: 2026-10-01 09:26 – Updated: 2026-10-01 09:26
VLAI
Title
Gutenberg Essential Blocks <= 6.4.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'marker' Attribute
Summary
The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Google Map block's 'marker' attribute in versions up to, and including, 6.4.5 This is due to insufficient input sanitization and output escaping on marker title/content values, which are stored as JSON and then decoded and concatenated directly into raw HTML by the frontend script's InfoWindow content builder. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Credits
Webbernaut
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Gutenberg Essential Blocks \u2013 Page Builder for Gutenberg Blocks \u0026 Patterns",
          "vendor": "wpdevteam",
          "versions": [
            {
              "lessThanOrEqual": "6.4.5",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Webbernaut"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Gutenberg Essential Blocks \u2013 Page Builder for Gutenberg Blocks \u0026 Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Google Map block\u0027s \u0027marker\u0027 attribute in versions up to, and including, 6.4.5 This is due to insufficient input sanitization and output escaping on marker title/content values, which are stored as JSON and then decoded and concatenated directly into raw HTML by the frontend script\u0027s InfoWindow content builder. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-01T09:26:57.815Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/606f25d9-f8c7-416a-8bb8-0cc57901ff5a?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.4.5/assets/blocks/google-map/frontend.js#L1"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.4.5/includes/Blocks/GoogleMap.php#L82"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.4.5/src/blocks/google-map/src/save.js#L35"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.3.0/assets/blocks/google-map/frontend.js#L1"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.3.0/includes/Blocks/GoogleMap.php#L82"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.3.0/src/blocks/google-map/src/save.js#L35"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3715353%40essential-blocks%2Ftags%2F6.4.6\u0026old=3706819%40essential-blocks%2Ftags%2F6.4.5"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset/3715353/essential-blocks/trunk/assets/blocks/google-map/frontend.js"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-22T19:37:10.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-09-30T20:30:35.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Gutenberg Essential Blocks \u003c= 6.4.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via \u0027marker\u0027 Attribute"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-96256",
    "datePublished": "2026-10-01T09:26:57.815Z",
    "dateReserved": "2026-09-22T19:20:02.066Z",
    "dateUpdated": "2026-10-01T09:26:57.815Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-96256",
      "date": "2026-10-02",
      "epss": "0.00292",
      "percentile": "0.19804"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Gutenberg Essential Blocks \u2013 Page Builder for Gutenberg Blocks \u0026 Patterns",
                "vendor": "wpdevteam",
                "versions": [
                  {
                    "lessThanOrEqual": "6.4.5",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "security@wordfence.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The Gutenberg Essential Blocks \u2013 Page Builder for Gutenberg Blocks \u0026 Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Google Map block\u0027s \u0027marker\u0027 attribute in versions up to, and including, 6.4.5 This is due to insufficient input sanitization and output escaping on marker title/content values, which are stored as JSON and then decoded and concatenated directly into raw HTML by the frontend script\u0027s InfoWindow content builder. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page."
          }
        ],
        "id": "CVE-2026-96256",
        "lastModified": "2026-10-01T12:40:28.083",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.4,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.1,
              "impactScore": 2.7,
              "source": "security@wordfence.com",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-10-01T10:17:17.613",
        "references": [
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.3.0/assets/blocks/google-map/frontend.js#L1"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.3.0/includes/Blocks/GoogleMap.php#L82"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.3.0/src/blocks/google-map/src/save.js#L35"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.4.5/assets/blocks/google-map/frontend.js#L1"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.4.5/includes/Blocks/GoogleMap.php#L82"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.4.5/src/blocks/google-map/src/save.js#L35"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/changeset/3715353/essential-blocks/trunk/assets/blocks/google-map/frontend.js"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3715353%40essential-blocks%2Ftags%2F6.4.6\u0026old=3706819%40essential-blocks%2Ftags%2F6.4.5"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/606f25d9-f8c7-416a-8bb8-0cc57901ff5a?source=cve"
          }
        ],
        "sourceIdentifier": "security@wordfence.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-79"
              }
            ],
            "source": "security@wordfence.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.