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Dompurify EUVDEUVD-2026-48582

| CVE-2026-66010 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-24 VulnCheck GHSA-jxrp-r7gx-q4j8
XSS Dompurify Cure53
5.1
CVSS 4.0 · Vendor: VulnCheck
View

Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 26, 2026

DOMPurify before 3.4.12 fails to invoke the afterSanitizeElements hook for custom elements permitted via CUSTOM_ELEMENT_HANDLING.tagNameCheck, enabling attackers to retain

Affected VersionsENISA

DOMPurify 0 <3.4.12

Affected Packages

npm dompurify fix: 3.4.12

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (VulnCheck) PRIMARY 5.1 MEDIUM
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
SUSE 6.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Red Hat 6.1 MEDIUM

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Active
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
None
Vulnerable system: Availability
None
Subsequent system: Confidentiality
Low
Subsequent system: Integrity
Low
Subsequent system: Availability
None

Lifecycle Timeline

1
Patch available
Jul 24, 2026 - 14:32 EUVD

DescriptionCVE.org

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.

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 294 npm packages depend on dompurify (79 direct, 215 indirect)

Ecosystem-wide dependent count for version 3.4.12.

Threat Intelligence Overview

EPSS Score
0.2%
Top 94% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
Poc
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

More in Dompurify

View all
CVE-2024-47875 MEDIUM POC
6.1 Oct 11

DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. Rated medium severity (CVSS 6
CVE-2020-26870 MEDIUM POC
6.1 Oct 07

Cure53 DOMPurify before 2.0.17 allows mutation XSS. Rated medium severity (CVSS 6.1), this vulnerability is remotely exp
CVE-2019-16728 MEDIUM POC
6.1 Sep 24

DOMPurify before 2.0.1 allows XSS because of innerHTML mutation XSS (mXSS) for an SVG element or a MATH element, as demo
CVE-2024-48910 CRITICAL
9.8 Oct 31

DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. Rated critical severity (CVSS
CVE-2026-65914 MEDIUM POC
5.3 Jul 23

Mutation-XSS in DOMPurify before 3.3.2 enables JavaScript execution in victim browsers when sanitized output is re-inser
CVE-2026-65902 MEDIUM POC
5.3 Jul 23

Hook mutation pollution in DOMPurify <= 3.4.5 allows persistent bypass of HTML sanitization defaults when application-in
CVE-2026-65899 MEDIUM POC
5.1 Jul 23

Trusted Types policy state contamination in DOMPurify 3.0.0-3.4.8 allows a previously supplied TRUSTED_TYPES_POLICY to s
CVE-2026-65913 MEDIUM POC
5.1 Jul 23

Prototype pollution in DOMPurify's USE_PROFILES mode enables DOM-based XSS by causing the sanitizer to accept event hand
CVE-2026-65912 MEDIUM POC
5.1 Jul 23

URI validation bypass in DOMPurify 3.3.1 and earlier allows `javascript:` protocol payloads to survive HTML sanitization
CVE-2026-65900 MEDIUM POC
5.1 Jul 23

SAFE_FOR_TEMPLATES bypass in DOMPurify 3.0.0-3.4.7 allows template expressions such as ${evil}, {{evil}}, and <%evil%> t
CVE-2026-65901 MEDIUM POC
5.1 Jul 23

Cross-site scripting in DOMPurify 3.4.6 and earlier enables script execution when the library's IN_PLACE sanitization mo
CVE-2026-65898 MEDIUM POC
5.1 Jul 23

Stored XSS is achievable in applications using DOMPurify's setConfig() API combined with an uponSanitizeAttribute hook t

Same weakness CWE-79 – Cross-site Scripting (XSS)

View all
CVE-2020-3580 MEDIUM POC
6.1
CVE-2013-7389 MEDIUM POC
4.3
CVE-2021-25299 MEDIUM POC
6.1
CVE-2014-2120 MEDIUM
6.1
CVE-2023-40000 HIGH POC
8.3
CVE-2016-8581 MEDIUM POC
6.1
CVE-2013-5223 MEDIUM POC
5.4
CVE-2025-52367 MEDIUM POC
5.4

Same technique XSS

View all
CVE-2017-9248 CRITICAL POC
9.8
CVE-2013-1710 CRITICAL POC
10.0
CVE-2024-52875 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Module for SAP Applications 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Server 16.1 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Affected
SUSE Linux Enterprise Server for SAP applications 16.0 Affected

References

Advisories & patches
ADVISORY https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-66010 ADVISORY https://vuldb.com/vuln/382908 REF https://www.vulncheck.com/advisories/dompurify-before-hook-bypass-via-custom-element-handling

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