Which versions of Dompurify are affected by CVE-2026-0540?

CVE-2026-0540 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 5.3. Attackers could inject scripts to steal sessions or perform actions as authenticated users.. A patch is available.

How to fix or mitigate CVE-2026-0540?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Dompurify CVE-2026-0540

Q: What is the CVSS score of CVE-2026-0540?

CVE-2026-0540 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-03-03 disclosure@vulncheck.com

GHSA-v2wj-7wpq-c8vv

XSS Red Hat Dompurify Suse Cure53

5.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

SUSE

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Red Hat

6.1 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Patch released

Mar 25, 2026 - 16:16 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

CVE Published

Mar 03, 2026 - 18:16 nvd

MEDIUM 5.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

26 npm packages depend on dompurify (11 direct, 15 indirect)

Ecosystem-wide dependent count for version 3.1.3.

DescriptionCVE.org

DOMPurify 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8, fixed in commit 729097f, contain a cross-site scripting vulnerability that allows attackers to bypass attribute sanitization by exploiting five missing rawtext elements (noscript, xmp, noembed, noframes, iframe) in the SAFE_FOR_XML regex. Attackers can include payloads like </noscript><img src=x onerror=alert(1)> in attribute values to execute JavaScript when sanitized output is placed inside these unprotected rawtext contexts.

AnalysisAI

DOMPurify versions 2.5.3-2.5.8 and 3.1.3-3.3.1 fail to sanitize attribute values within certain rawtext HTML elements (noscript, xmp, noembed, noframes, iframe), allowing attackers to inject malicious scripts that execute when sanitized content is rendered in these contexts. An attacker can exploit this by embedding JavaScript payloads in HTML attributes, bypassing DOMPurify's sanitization to achieve cross-site scripting. A patch is available in commit 729097f.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Dompurify. DOMPurify 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8, fixed in commit 729097f, contain a cross-site scripting vulnerability that allows attackers to bypass attribute sanitization by exploiting five missing rawtext elements (noscript, xmp, noembed, noframes, iframe) in the SAFE_FOR_XML regex. Attackers can include payloads like </noscript><img src=x onerror=alert(1)> in attribute values to execute JavaScript when sanitized output is placed inside these unprotected rawtext contexts.

RemediationAI

A vendor patch is available — apply it immediately. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.