MEDIUM

CVE-2026-49458

CVSS v3

6.1

MEDIUM

EPSS Score

0.4 %

exploit probability, as of 2026-10-18

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

dompurifynpmall versions · fixed in 3.4.6

Vendor advisories

CVE-2026-49458 Red Hat Product Security47 known affected
dompurify: DOMPurify: Cross-site scripting due to improper sanitization of DOM nodes
migration-toolkit-virtualization/mtv-console-plugin-rhel9 as a component of Migration Toolkit for Virtualization · mtv-candidate/mtv-console-plugin-rhel9 as a component of Migration Toolkit for Virtualization · multicluster-engine/console-mce-rhel9 as a component of Multicluster Engine for Kubernetes

Full record on NVD

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published: 2026-07-14
Last Modified: 2026-07-15

Frequently asked questions

What is CVE-2026-49458?

Is CVE-2026-49458 actively exploited?

Active exploitation of CVE-2026-49458 has not been confirmed. Its EPSS score was 0.4% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-49458?

CVE-2026-49458 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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