CVE-2026-0540Public exploitNetwork attack vector

Cross-site scripting via incomplete rawtext regex

Published Mar 3, 2026 · Updated Mar 3, 2026

Cross-site scripting in Cure53 DOMPurify 2.5.3 through 2.5.8 and 3.1.3 through 3.3.1 allows attackers to execute JavaScript. The SAFE_FOR_XML attribute-value check omits noscript, xmp, noembed, noframes and iframe from its rawtext closing-tag regex, so crafted closing tags survive sanitization. Execution requires sanitized output to be inserted into one of those rawtext contexts and a user to render the resulting markup; impact is confined to the consuming application's browser context.

CVSS severity5.1
Medium
EPSS probability0.34%
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 2.5.3 through 2.5.8 and 3.1.3 through 3.3.1 allows attackers to execute JavaScript. The SAFE_FOR_XML attribute-value check omits noscript, xmp, noembed, noframes and iframe from its rawtext closing-tag regex, so crafted closing tags survive sanitization. Execution requires sanitized output to be inserted into one of those rawtext contexts and a user to render the resulting markup; impact is confined to the consuming application's browser context.

The record

CVE
CVE-2026-0540
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
Cure53
Product
DOMPurify
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 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=2.5.3 <=2.5.8
  2. Affected versionversion=3.1.3 <=3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cure53 · DOMPurifyversion=2.5.3 <=2.5.8; version=3.1.3 <=3.3.1

Published CVSS scores

6.1Fluid AttacksCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1Fluid AttacksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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