Read the docs
TI-2026-34986 Aliases CVE-2026-47423GHSA-87xg-pxx2-7hvx

DOMPurify XSS via `selectedcontent` re-clone

Priority HIGH 69CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · Low · None
Fix status
Partial Red Hat: 1 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-79.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0041 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial DOMPurify (cure53): 3.4.5dompurify (npm): 3.4.5Red Hat: 1 advisoryRed Hat: 1 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
cure53DOMPurify3.4.4 to before 3.4.53.4.5Patch availableCNA
—dompurify (npm)3.4.4 to before 3.4.53.4.5Patch availableGHSA-87xg-pxx2-7hvx
  • DOMPurify Vendorcure53 Affected 3.4.4 to before 3.4.5 Fixed in 3.4.5 Patch available CNA
  • dompurify (npm) Vendor— Affected 3.4.4 to before 3.4.5 Fixed in 3.4.5 Patch available GHSA-87xg-pxx2-7hvx

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cure53:dompurify:3.4.4:*:*:*:*:*:*:*3.4.4Vulnerablecure53
  • cpe:2.3:a:cure53:dompurify:3.4.4:*:*:*:*:*:*:* Versions 3.4.4 Vulnerable ·cure53

Remediation

  • Fix · CNA DOMPurify (cure53) Fixed in 3.4.5
  • Fix · GHSA-87xg-pxx2-7hvx dompurify (npm) Fixed in 3.4.5 Advisory →

Red Hat 1 advisory

  • RHSA-2026:10999 Released 2026-04-27 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3-ruff-0.15.11-1.hum1@noarch@public-hummingbird-aarch64-rpms, python3-ruff-0.15.11-1.hum1@noarch@public-hummingbird-x86_64-rpms, ruff-0.15.11-1.hum1@aarch64 +2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Ceph Storage 9AffectedNo fix yet: Fix deferred
Red Hat Openshift Data Foundation 4AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:10999
Not affected: 25 products
  • Cryostat 4
  • Migration Toolkit for Virtualization
  • Multicluster Engine for Kubernetes
  • Node HealthCheck Operator
  • OpenShift Lightspeed
  • OpenShift Service Mesh 3
  • Red Hat AMQ Broker 7
  • Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Advanced Cluster Security 4
  • Red Hat Ansible Automation Platform 2
  • Red Hat Build of Podman Desktop
  • Red Hat Data Grid 8
  • Red Hat Developer Hub 1
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5
  • Red Hat OpenShift Dev Spaces
  • Red Hat OpenShift GitOps
  • Red Hat OpenShift Virtualization 4
  • Red Hat Openshift Data Foundation 4
  • Red Hat build of Apache Camel - HawtIO 4
  • Red Hat build of Apache Camel for Spring Boot 4
  • Self-service automation portal 2
  • streams for Apache Kafka 2
  • streams for Apache Kafka 3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47423
  2. 2026-10-03 Alias added: GHSA-87xg-pxx2-7hvx
  3. 2026-10-27 Affected versions changed · Red Hat
  4. 2026-10-31 Affected versions changed · Red Hat

References

Exploit 1

Patch 1

Other 2

  • TI-2026-36811 DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content CVSS 4.0MEDIUM 6.3
  • TI-2026-36614 DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM CVSS 3.1MEDIUM 6.1
  • TI-2026-36613 DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks CVSS 3.1MEDIUM 6.1
  • TI-2026-29849 DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix) CVSS 4.0MEDIUM 6.0
  • TI-2025-19705 Cross-site scripting in cure53 DOMPurify CVSS 3.1MEDIUM 6.1
  • TI-2026-46952 DOMPurify before 3.3.2 Mutation XSS via Re-Contextualization CVSS 4.0MEDIUM 5.3
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences