CVE-2026-116803

DOMPurify before 3.4.17 DOM XSS via IN_PLACE Hook-Detached Subtrees

MEDIUM 5.1

At a glance

Source: NVD
EPSS: EPSS 0.16 % · percentile 6 (2026-10-28)
State: PUBLISHED
Published: 2026-10-26 23:05 UTC
Updated: 2026-10-26 23:05 UTC
Assigner: VulnCheck
NVD status: Awaiting Analysis

Description

DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to keep event handlers armed when an IN_PLACE hook removes a parent or sibling node. Attacker markup in detached subtrees is never walked or neutralized, so handlers like img onerror fire after sanitize() returns, causing DOM XSS.

Weaknesses (CWE)

CWE-79 — Improper Neutralization of Input During Web Page Generation

References

Scores

Version	Score	Vector	Scored by
CVSS 4.0	MEDIUM 5.1	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	VulnCheck
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	VulnCheck
CVSS 4.0	MEDIUM 5.1	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/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	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	NVD · disclosure@vulncheck.com (Primary)

Advisories

GHSA-mrv2-3pqr-j5jr — DOMPurify IN_PLACE: hook that removes a parent or sibling leaves the detached subtree's event handlers armed (incomplete fix for GHSA-p98j-92pf-mc4p)

European references

ENISA EUVD · EUVD-2026-110511
GCVE · GCVE-0-2026-116803

Affected products

Product	Versions
cure53 · DOMPurify	affected 0 < 3.4.17 ; unaffected 3.4.17

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD