Vulnerability-Lookup

GHSA-FQHH-M4M2-4PC6

Vulnerability from github – Published: 2026-05-27 09:31 – Updated: 2026-05-27 09:31

Details

The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'bitform' shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes ('width' and 'height') in the Shortcode::shortcode() function, which are interpolated directly into the 'style' attribute of an element. 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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-8891"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T07:16:17Z",
    "severity": "MODERATE"
  },
  "details": "The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin\u0027s \u0027bitform\u0027 shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (\u0027width\u0027 and \u0027height\u0027) in the Shortcode::shortcode() function, which are interpolated directly into the \u0027style\u0027 attribute of an \u003ciframe\u003e element. 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": "GHSA-fqhh-m4m2-4pc6",
  "modified": "2026-05-27T09:31:14Z",
  "published": "2026-05-27T09:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8891"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/bitform/tags/1.1.0/Common/Shortcode.php#L13"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/bitform/tags/1.1.0/Common/Shortcode.php#L17"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/bitform/tags/1.1.0/index.php#L54"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/71167dec-38ec-4eb3-8fab-25eca0f8b071?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-2026-8891 (GCVE-0-2026-8891)

Vulnerability from cvelistv5 – Published: 2026-05-27 05:31 – Updated: 2026-05-27 10:35

Title

BitForm <= 1.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Summary

The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'bitform' shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes ('width' and 'height') in the Shortcode::shortcode() function, which are interpolated directly into the 'style' attribute of an <iframe> element. 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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Wordfence

References

4 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/bitfor…
https://plugins.trac.wordpress.org/browser/bitfor…
https://plugins.trac.wordpress.org/browser/bitfor…

Impacted products

1 product

Vendor	Product	Version
bitform	BitForm – Data management solution for WordPress	Affected: 0 , ≤ 1.1.0 (semver)

Credits

Muhammad Yudha - DJ

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-8891",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-27T10:22:11.157406Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-27T10:35:13.126Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "BitForm \u2013 Data management solution for WordPress",
          "vendor": "bitform",
          "versions": [
            {
              "lessThanOrEqual": "1.1.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Muhammad Yudha - DJ"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin\u0027s \u0027bitform\u0027 shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (\u0027width\u0027 and \u0027height\u0027) in the Shortcode::shortcode() function, which are interpolated directly into the \u0027style\u0027 attribute of an \u003ciframe\u003e element. 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)",
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      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/71167dec-38ec-4eb3-8fab-25eca0f8b071?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/bitform/tags/1.1.0/Common/Shortcode.php#L17"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/bitform/tags/1.1.0/Common/Shortcode.php#L13"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/bitform/tags/1.1.0/index.php#L54"
        }
      ],
      "timeline": [
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          "time": "2026-05-26T17:27:05.000Z",
          "value": "Disclosed"
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      ],
      "title": "BitForm \u003c= 1.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
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    "cveId": "CVE-2026-8891",
    "datePublished": "2026-05-27T05:31:27.284Z",
    "dateReserved": "2026-05-18T20:50:09.614Z",
    "dateUpdated": "2026-05-27T10:35:13.126Z",
    "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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-FQHH-M4M2-4PC6

CVE-2026-8891 (GCVE-0-2026-8891)

Tags

Sightings

Nomenclature