CVE-2026-65913Public exploitNetwork attack vector

DOM-based XSS via inherited attribute allowlisting

Published Jul 23, 2026 · Updated Jul 23, 2026

Prototype pollution in Cure53 DOMPurify before 3.3.2 allows remote attackers to trigger DOM-based XSS through sanitized markup. With USE_PROFILES enabled, ALLOWED_ATTR is rebuilt as a plain array, and attribute checks treat inherited Array.prototype properties as allowlisted. Exploitation requires a polluted Array.prototype and rendering of the sanitized markup, which executes retained event handlers in a user's browser.

CVSS severity5.1
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Cure53 DOMPurify before 3.3.2 allows remote attackers to trigger DOM-based XSS through sanitized markup. With USE_PROFILES enabled, ALLOWED_ATTR is rebuilt as a plain array, and attribute checks treat inherited Array.prototype properties as allowlisted. Exploitation requires a polluted Array.prototype and rendering of the sanitized markup, which executes retained event handlers in a user's browser.

The record

CVE
CVE-2026-65913
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
Cure53
Product
DOMPurify
Classifications
CWE-1321, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 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=0 <3.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cure53 · DOMPurifyversion=0 <3.3.2

Published CVSS scores

5.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
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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