What is the CVSS score of CVE-2026-66010?

CVE-2026-66010 has a CVSS 4.0 base score of 5.1 (Medium). CVSS vector: 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. EPSS exploitation probability: 0.2%.

Is there a patch available for CVE-2026-66010?

Yes, a patch is available for CVE-2026-66010. Update the affected software to the latest version immediately.

Dompurify CVE-2026-66010

EUVD-2026-48582 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.

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

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.

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

Human Impact· derived

Medium

Technical Impact

Partial

Priority Score

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 This Month 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 This Month 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 This Month 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 Act Now

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 This Month 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 This Month 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 This Month 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 This Month 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 This Month 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 This Month 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 This Month 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 This Month 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

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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