CVE-2026-116803
DOMPurify before 3.4.17 DOM XSS via IN_PLACE Hook-Detached Subtrees
- State
- Published
- Severity
- 5.1 Medium
- Published
- Oct 26, 2026
- Updated
- Oct 26, 2026
- Reserved
- Oct 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | 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 |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
DOMPurifycure53 |
|
References
- GitHub Security Advisory (GHSA-mrv2-3pqr-j5jr)vendor-advisory
- VulnCheck Advisory: DOMPurify before 3.4.17 DOM XSS via IN_PLACE Hook-Detached Subtreesthird-party-advisory
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