CVE-2026-47423Public exploitNetwork attack vector

Cross-site scripting via selectedcontent browser re-cloning

Published Jul 14, 2026 · Updated Jul 14, 2026

Cross-site scripting in Cure53 DOMPurify 3.4.4 allows remote attackers to execute script via crafted HTML sanitized as a string. DOMPurify's default allowlist admits selectedcontent, and browser re-cloning refreshes an already-walked subtree from option content after sanitization, returning an unsanitized event handler. Exploitation requires an application to sanitize attacker-controlled HTML through the string-input path and insert the returned string into a page; Chromium and WebKit execute the re-cloned payload.

CVSS severity8.2
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Cure53 DOMPurify 3.4.4 allows remote attackers to execute script via crafted HTML sanitized as a string. DOMPurify's default allowlist admits selectedcontent, and browser re-cloning refreshes an already-walked subtree from option content after sanitization, returning an unsanitized event handler. Exploitation requires an application to sanitize attacker-controlled HTML through the string-input path and insert the returned string into a page; Chromium and WebKit execute the re-cloned payload.

The record

CVE
CVE-2026-47423
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Cure53
Product
DOMPurify
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.4.4, < 3.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cure53 · DOMPurifyversion=>= 3.4.4, < 3.4.5

Published CVSS scores

8.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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