GHSA-jxrp-r7gx-q4j8: Duplicate Advisory DOMPurify: `CUSTOM_ELEMENT_HANDLING` Bypasses `afterSanitizeElements` For Vulnerability

MODERATE
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CVSS 6.1
CWE-79
Published
Advisory Summary

GHSA-jxrp-r7gx-q4j8 is a MODERATE (CVSS 6.1) dompurify: `custom_element_handling` bypasses `aftersanitizeelements` for vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Duplicate Advisory libraries in the npm ecosystem. The issue involves dompurify: `custom_element_handling` bypasses `aftersanitizeelements` for allowed custom elements.. Remediation is available in the latest vendor maintenance releases.

GHSA-jxrp-r7gx-q4j8 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-jxrp-r7gx-q4j8
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Duplicate Advisory
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix GHSA-jxrp-r7gx-q4j8

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

dompurify fixed: Latest secure release 
npm install dompurify@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls dompurify

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-jxrp-r7gx-q4j8, inspect your project dependencies using npm:

npm ls dompurify

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls dompurify command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-c2j3-45gr-mqc4. This link is maintained to preserve external references. ## Original Description DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.

GHSA-jxrp-r7gx-q4j8 Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
dompurify
npm/dompurify
npm
≤ 3.4.11

References

GitHub Advisory / Wiki ADVISORY
https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4
NVD — GHSA-jxrp-r7gx-q4j8 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66010
www.vulncheck.com/advisories/dompurif... WEB
https://www.vulncheck.com/advisories/dompurify-before-hook-bypass-via-custom-element-handling

Frequently Asked Questions

What is GHSA-jxrp-r7gx-q4j8?
GHSA-jxrp-r7gx-q4j8 is a security vulnerability in Duplicate Advisory involving DOMPurify: `CUSTOM_ELEMENT_HANDLING` bypasses `afterSanitizeElements` for allowed custom elements. under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: dompurify.
What version fixes GHSA-jxrp-r7gx-q4j8?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is dompurify affected?
Yes, dompurify is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of GHSA-jxrp-r7gx-q4j8?
GHSA-jxrp-r7gx-q4j8 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with GHSA-jxrp-r7gx-q4j8?
GHSA-jxrp-r7gx-q4j8 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for GHSA-jxrp-r7gx-q4j8?
Run the dependency tree command: 'npm ls dompurify'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jxrp-r7gx-q4j8",
  "modified" : "2026-10-02T22:43:11Z",
  "published" : "2026-07-24T15:33:01Z",
  "withdrawn" : "2026-10-02T22:43:11Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: DOMPurify: `CUSTOM_ELEMENT_HANDLING` bypasses `afterSanitizeElements` for allowed custom elements.",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-c2j3-45gr-mqc4. This link is maintained to preserve external references.\n\n## Original Description\n\nDOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "dompurify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.4.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-66010"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/dompurify-before-hook-bypass-via-custom-element-handling"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-02T22:43:11Z",
    "nvd_published_at" : "2026-07-24T13:18:28Z"
  }
}