CVE-2026-47423: DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG

Q: How urgent is CVE-2026-47423?

Priority 42/100. High severity; Public exploit reference

This month

HIGH 8.2DOWNGRADE

CVE-2026-47423 is a high-severity flaw (CVSS 8.2) affecting dompurify. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: cure53

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 20:17 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

cure53 dompurify DOWNGRADE

Affected: 3.4.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.4

1. Check installed version

apt-cache policy dompurify || rpm -q dompurify || dompurify --version

2. No fixed release: DOWNGRADE to a release before 3.4.4 (Debian / Ubuntu)

apt-cache madison dompurify sudo apt install dompurify=<VERSION_BEFORE_3.4.4> sudo apt-mark hold dompurify

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list dompurify sudo dnf downgrade dompurify-<VERSION_BEFORE_3.4.4> sudo dnf versionlock add dompurify

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47423?

dompurify: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-47423 being exploited?

CVE-2026-47423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47423 affect?

CVE-2026-47423 affects dompurify. Severity is high (CVSS 8.2). 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 <sel

How urgent is CVE-2026-47423?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2026-49458 MEDIUM 6.1 UPGRADE DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG
CVE-2026-49978 MEDIUM 6.1 UPGRADE DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG
CVE-2026-49459 MEDIUM 6.1 UPGRADE DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG
CVE-2026-65898 HIGH 7.2 UPGRADE DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitiz
CVE-2026-65899 MEDIUM 6.1 UPGRADE DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so

References

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