Vulnerability-Lookup

GHSA-X6H5-Q644-MQ4F

Vulnerability from github – Published: 2026-11-03 06:31 – Updated: 2026-11-03 06:31

Details

The SEO Engine – Smart SEO with AI, Schema & Redirection for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' parameter in all versions up to, and including, 0.9.9 due to insufficient input sanitization and output escaping. 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. WordPress core's wp_filter_kses (applied via title_save_pre for Contributors and Authors) strips literal tag markup on save but leaves HTML-entity-encoded payloads intact in the database, meaning entity-encoded XSS payloads stored via the standard WordPress REST API (POST /wp-json/wp/v2/posts) are not neutralized before reaching the vulnerable sink.

Severity

6.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-120552"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-03T05:18:32Z",
    "severity": "MODERATE"
  },
  "details": "The SEO Engine \u2013 Smart SEO with AI, Schema \u0026 Redirection for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the \u0027title\u0027 parameter in all versions up to, and including, 0.9.9 due to insufficient input sanitization and output escaping. 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. WordPress core\u0027s wp_filter_kses (applied via title_save_pre for Contributors and Authors) strips literal tag markup on save but leaves HTML-entity-encoded payloads intact in the database, meaning entity-encoded XSS payloads stored via the standard WordPress REST API (POST /wp-json/wp/v2/posts) are not neutralized before reaching the vulnerable sink.",
  "id": "GHSA-x6h5-q644-mq4f",
  "modified": "2026-11-03T06:31:13Z",
  "published": "2026-11-03T06:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120552"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/app/index.js"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/core.php#L739"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/core.php#L744"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/rest.php#L1381"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/rest.php#L164"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?old_path=/seo-engine/tags/0.9.9\u0026new_path=/seo-engine/tags/1.0.0"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/454a05eb-fd4e-4125-abd0-7ba90ee2048a?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-120552 (GCVE-0-2026-120552)

Vulnerability from cvelistv5 – Published: 2026-11-03 04:43 – Updated: 2026-11-03 19:03

Title

SEO Engine <= 0.9.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Entity-Encoded Post Title via Strip-then-Decode in build_title()

Summary

Severity

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-03 19:03 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation

Assigner

Wordfence CNA under the mitre root

CNA scorecard C 65/100 over 2379 records in the last 180 days details

References

7 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/seo-en…
https://plugins.trac.wordpress.org/browser/seo-en…
https://plugins.trac.wordpress.org/browser/seo-en…
https://plugins.trac.wordpress.org/browser/seo-en…
https://plugins.trac.wordpress.org/browser/seo-en…
https://plugins.trac.wordpress.org/changeset?old_…

Impacted products

1 product

Vendor	Product	Version
tigroumeow	SEO Engine – Smart SEO with AI, Schema & Redirection for WordPress	Affected: 0 , ≤ 0.9.9 (semver)

Credits

Wordfence PRISM

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-120552",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-03T19:03:45.420760Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-03T19:03:57.109Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "SEO Engine \u2013 Smart SEO with AI, Schema \u0026 Redirection for WordPress",
          "vendor": "tigroumeow",
          "versions": [
            {
              "lessThanOrEqual": "0.9.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Wordfence PRISM"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The SEO Engine \u2013 Smart SEO with AI, Schema \u0026 Redirection for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the \u0027title\u0027 parameter in all versions up to, and including, 0.9.9 due to insufficient input sanitization and output escaping. 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. WordPress core\u0027s wp_filter_kses (applied via title_save_pre for Contributors and Authors) strips literal tag markup on save but leaves HTML-entity-encoded payloads intact in the database, meaning entity-encoded XSS payloads stored via the standard WordPress REST API (POST /wp-json/wp/v2/posts) are not neutralized before reaching the vulnerable sink."
        }
      ],
      "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",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T04:43:07.297Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/454a05eb-fd4e-4125-abd0-7ba90ee2048a?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/core.php#L744"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/core.php#L739"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/rest.php#L1381"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/classes/rest.php#L164"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/seo-engine/tags/0.9.9/app/index.js"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?old_path=/seo-engine/tags/0.9.9\u0026new_path=/seo-engine/tags/1.0.0"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-10-27T21:29:51.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-10-30T15:47:27.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "SEO Engine \u003c= 0.9.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Entity-Encoded Post Title via Strip-then-Decode in build_title()"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-120552",
    "datePublished": "2026-11-03T04:43:07.297Z",
    "dateReserved": "2026-11-02T16:25:53.708Z",
    "dateUpdated": "2026-11-03T19:03:57.109Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

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