Cross-Site Scripting (XSS) in dompurify (CVE-2026-65901)
Summary
Cross-site scripting in dompurify (CVE-2026-65901). Risk of unauthorized operations or information disclosure. Exploitable via DOMPurify.
Original description
The description as published by the source.
Summary
When DOMPurify.sanitize(root, { IN_PLACE: true }) is called on an attacker-supplied live DOM node, DOMPurify still trusts currentNode.nodeName for non-form nodes in the main _sanitizeElements pipeline. A real `` child node whose observable nodeName is attacker-controlled can therefore be misclassified as an allowed element and retained. When the sanitized tree is inserted into a live document, the script executes.
This affects current 3.4.6. The recent IN_PLACE hardening work covers clobbered form handling and foreign-realm shadow/template traversal, but does not harden the main per-node element decision for hostile non-form live nodes.
Affected
- DOMPurify
3.4.6 - Any caller that does
DOMPurify.sanitize(node, { IN_PLACE: true })on attacker-supplied live DOM nodes - Verified attacker-controlled node sources:
- same-origin
iframe→ live node passed by reference - same-origin
window.open()popup → live node passed by reference - same-origin foreign node adopted into the host document via
document.adoptNode(node)and then sanitized in-place
- same-origin
Not affected:
- String-input
DOMPurify.sanitize(dirtyString)
Vulnerability details
Code paths
[A] — _sanitizeElements uses the instance-visible nodeName for the allow/forbid decision:
const _sanitizeElements = function (currentNode: any): boolean {
...
if (_isClobbered(currentNode)) {
_forceRemove(currentNode);
return true;
}
const tagName = trans…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-65901 has been found in dompurify.
Attackers can target a specific entry point like DOMPurify over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "dompurify CVE-2026-65901" on the vendor's site.
CVE-2026-65901 (dompurify) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: DOMPurify / currentNode.nodeName / form / _sanitizeElements
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in dompurify. Attackers reach the vulnerable code path via DOMPurify without authentication.
Check the vendor advisory for the affected versions of dompurify. Attack surface: DOMPurify / currentNode.nodeName / form / _sanitizeElements.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'dompurify' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'dompurify' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
dompurifyを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-65901 node-dompurify
References
- advisory disclosure@vulncheck.com
- exploit github.com
- web github.com