Vulnerability-Lookup

CVE-2026-73648 (GCVE-0-2026-73648)

Vulnerability from cvelistv5 – Published: 2026-08-13 18:00 – Updated: 2026-08-13 18:35

Title

rails-html-sanitizer: Possible XSS vulnerability with certain configurations

Summary

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. From 1.0.3 until 1.7.1, Rails::HTML::PermitScrubber restricted SVG reference elements in SVG_ALLOW_LOCAL_HREF only when they used xlink:href, even though browsers also accept the plain href attribute. Applications with non-default allowed tags that included SVG use or feImage elements could therefore permit external references; a same-origin external SVG referenced by use could execute scripts in the sanitized document's context, while feImage could load external images for tracking. Applications using the default allowed tags are not affected. This issue is fixed in version 1.7.1.

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 18:34 UTC

CWE

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

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/rails/rails-html-sanitizer/sec…	x_refsource_CONFIRM
https://github.com/rails/rails-html-sanitizer/pull/223	x_refsource_MISC
https://github.com/rails/rails-html-sanitizer/com…	x_refsource_MISC
https://github.com/rails/rails-html-sanitizer/rel…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
rails	rails-html-sanitizer	Affected: >= 1.0.3, < 1.7.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-73648

Vulnerability from fkie_nvd - Published: 2026-08-13 18:18 - Updated: 2026-08-13 19:17

Severity

5.1 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/rails/rails-html-sanitizer/commit/74dcb8053e6da9921246ce71b06ad9fd65b19586
	security-advisories@github.com	https://github.com/rails/rails-html-sanitizer/pull/223
	security-advisories@github.com	https://github.com/rails/rails-html-sanitizer/releases/tag/v1.7.1
	security-advisories@github.com	https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-cj75-f6xr-r4g7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "affectedData": [
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          "product": "rails-html-sanitizer",
          "vendor": "rails",
          "versions": [
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    }
  ],
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GHSA-CJ75-F6XR-R4G7

Vulnerability from github – Published: 2026-07-21 22:05 – Updated: 2026-08-13 18:00

Summary

Rails HTML Sanitizers: Possible XSS vulnerability with certain configurations

Details

Summary

There is a possible cross-site scripting vulnerability in rails-html-sanitizer when the sanitizer is configured to allow an SVG reference element such as <use>. See related GHSA-9wjq-cp2p-hrgf in Loofah, whose SVG local-reference logic rails-html-sanitizer mirrors.

Versions affected: >= 1.0.3, < 1.7.1
Not affected: < 1.0.3
Fixed versions: 1.7.1

Impact

Rails::HTML::PermitScrubber restricts SVG reference elements in the SVG_ALLOW_LOCAL_HREF collection to local, same-document references, but that restriction covered only the xlink:href attribute. Browsers also accept a plain href attribute per the SVG 2 spec, and it was not restricted, so those elements could reference arbitrary external documents. SVG <use> can load and render external SVG content by reference, and if the referenced document is same-origin and contains scripts, it could execute in the context of the sanitized document. <feImage> can load external images, which can be used for tracking.

Applications are impacted only when the allowed tags are overridden to include one of these SVG reference elements, for example <use> or <feImage>. The default allowed tags do not include these SVG elements, so applications using the default configuration are not affected.

Workarounds

Remove the SVG reference elements (such as use and feImage) from the overridden allowed tags. Applications using the default allowed tags are not affected.

References

Credit

Found by maintainer Mike Dalessio during a security audit.

Severity

5.1 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Show details on source website

JSON

To clipboard

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      "package": {
        "ecosystem": "RubyGems",
        "name": "rails-html-sanitizer"
      },
      "ranges": [
        {
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            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73648"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T22:05:28Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThere is a possible cross-site scripting vulnerability in rails-html-sanitizer when the sanitizer is configured to allow an SVG reference element such as `\u003cuse\u003e`. See related [GHSA-9wjq-cp2p-hrgf](https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf) in Loofah, whose SVG local-reference logic rails-html-sanitizer mirrors.\n\n- Versions affected: `\u003e= 1.0.3, \u003c 1.7.1`\n- Not affected: `\u003c 1.0.3`\n- Fixed versions: `1.7.1`\n\n## Impact\n\n`Rails::HTML::PermitScrubber` restricts SVG reference elements in the `SVG_ALLOW_LOCAL_HREF` collection to local, same-document references, but that restriction covered only the `xlink:href` attribute. Browsers also accept a plain `href` attribute per the SVG 2 spec, and it was not restricted, so those elements could reference arbitrary external documents. SVG `\u003cuse\u003e` can load and render external SVG content by reference, and if the referenced document is same-origin and contains scripts, it could execute in the context of the sanitized document. `\u003cfeImage\u003e` can load external images, which can be used for tracking.\n\nApplications are impacted only when the allowed tags are overridden to include one of these SVG reference elements, for example `\u003cuse\u003e` or `\u003cfeImage\u003e`. The default allowed tags do not include these SVG elements, so applications using the default configuration are not affected.\n\n## Workarounds\n\nRemove the SVG reference elements (such as `use` and `feImage`) from the overridden allowed tags. Applications using the default allowed tags are not affected.\n\n## References\n\n- [GHSA-9wjq-cp2p-hrgf: SVG `href` attribute bypasses local-reference restriction in Loofah](https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf)\n- [CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)](https://cwe.mitre.org/data/definitions/79.html)\n\n## Credit\n\nFound by maintainer Mike Dalessio during a security audit.",
  "id": "GHSA-cj75-f6xr-r4g7",
  "modified": "2026-08-13T18:00:24Z",
  "published": "2026-07-21T22:05:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-cj75-f6xr-r4g7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails-html-sanitizer/commit/74dcb8053e6da9921246ce71b06ad9fd65b19586"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rails/rails-html-sanitizer"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails-html-sanitizer/releases/tag/v1.7.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Rails HTML Sanitizers: Possible XSS vulnerability with certain configurations"
}

ubuntu-cve-2026-73648

Vulnerability from osv_ubuntu

Published

2026-08-13 18:18

Modified

2026-08-19 11:11

Summary

Details

Severity

5.1 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-73648	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-73648	REPORT
	https://github.com/rails/rails-html-sanitizer/sec…	REPORT
	https://github.com/rails/rails-html-sanitizer/pull/223	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rails-html-sanitizer",
            "binary_version": "1.0.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ruby-rails-html-sanitizer",
        "purl": "pkg:deb/ubuntu/ruby-rails-html-sanitizer@1.0.3-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.2-1",
        "1.0.3-1",
        "1.0.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rails-html-sanitizer",
            "binary_version": "1.0.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "ruby-rails-html-sanitizer",
        "purl": "pkg:deb/ubuntu/ruby-rails-html-sanitizer@1.0.4-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.3-2",
        "1.0.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rails-html-sanitizer",
            "binary_version": "1.3.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ruby-rails-html-sanitizer",
        "purl": "pkg:deb/ubuntu/ruby-rails-html-sanitizer@1.3.0-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.4-1",
        "1.3.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rails-html-sanitizer",
            "binary_version": "1.4.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ruby-rails-html-sanitizer",
        "purl": "pkg:deb/ubuntu/ruby-rails-html-sanitizer@1.4.2-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.0-2",
        "1.4.2-1",
        "1.4.2-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rails-html-sanitizer",
            "binary_version": "1.4.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ruby-rails-html-sanitizer",
        "purl": "pkg:deb/ubuntu/ruby-rails-html-sanitizer@1.4.4-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rails-html-sanitizer",
            "binary_version": "1.6.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ruby-rails-html-sanitizer",
        "purl": "pkg:deb/ubuntu/ruby-rails-html-sanitizer@1.6.2-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.2-1"
      ]
    }
  ],
  "aliases": [],
  "details": "rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. From 1.0.3 until 1.7.1, Rails::HTML::PermitScrubber restricted SVG reference elements in SVG_ALLOW_LOCAL_HREF only when they used xlink:href, even though browsers also accept the plain href attribute. Applications with non-default allowed tags that included SVG use or feImage elements could therefore permit external references; a same-origin external SVG referenced by use could execute scripts in the sanitized document\u0027s context, while feImage could load external images for tracking. Applications using the default allowed tags are not affected. This issue is fixed in version 1.7.1.",
  "id": "UBUNTU-CVE-2026-73648",
  "modified": "2026-08-19T11:11:14Z",
  "published": "2026-08-13T18:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-73648"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-73648"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-cj75-f6xr-r4g7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rails/rails-html-sanitizer/pull/223"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-73648"
  ]
}

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.

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.

Action not permitted

CVE-2026-73648 (GCVE-0-2026-73648)

FKIE_CVE-2026-73648

GHSA-CJ75-F6XR-R4G7

Summary

Impact

Workarounds

References

Credit

ubuntu-cve-2026-73648

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature