TI-2026-71161 Aliases CVE-2026-109345 GHSA-cjhx-p48c-gfm9

Cross-site scripting in DOMPurify IN_PLACE mode bypasses sanitization

MEDIUM 56CWE-79Published 2026-10-12 · Updated 2026-10-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

DOMPurify before 3.4.16 contains a cross-site scripting flaw (CWE-79) in its IN_PLACE mode. The mode returns a force-removed style element whose text still carries markup, so sanitization is bypassed. An unauthenticated remote attacker who supplies a crafted style element can get script to run when the application serializes and re-parses the returned node.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

DOMPurify before 3.4.16 contains a cross-site scripting vulnerability that allows attackers to bypass sanitization because IN_PLACE mode returns a force-removed style element whose text content still carries markup. Attackers can supply a style element containing a closing style tag and an img onerror payload, which executes script when the application serializes and re-parses the returned node.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0025 16th percentileScored 2026-11-07

Fix Fixed DOMPurify (cure53): 3.4.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
cure53	DOMPurify	before 3.4.16	3.4.16	Patch available	CNA

DOMPurify Vendorcure53 Affected before 3.4.16 Fixed in 3.4.16 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:cure53:dompurify::::::::	—	—	cure53

cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:* Versions — — ·cure53

Remediation

Upgrade DOMPurify to version 3.4.16 or later, the fixed version listed for this product.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA DOMPurify (cure53) Fixed in 3.4.16

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-12
cure53 DOMPurify 3.4.16
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-71160 Cross-site scripting in DOMPurify IN_PLACE mode hooksPriority LOW 28
Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-10-12 Threatist record created from CVE-2026-109345
2026-10-12 Alias added: GHSA-cjhx-p48c-gfm9
2026-10-13 Affected versions changed · Red Hat
2026-10-13 CVSS score added · Red Hat
2026-10-13 CISA SSVC decision points changed
2026-10-13 Priority changed: LOW → MEDIUM

References

Advisory 1

GitHub Security Advisory (GHSA-6688-9rhm-gjv2)

TI-2026-34986 DOMPurify XSS via `selectedcontent` re-clone CVSS 3.1HIGH 8.2
TI-2025-30422 Path traversal in cure53 DOMPurify CVSS 3.1HIGH 7.5
TI-2026-29847 DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback CVSS 3.1MEDIUM 6.9
TI-2026-36811 DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content CVSS 4.0MEDIUM 6.3
TI-2026-36614 DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM CVSS 3.1MEDIUM 6.1
TI-2026-36613 DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks CVSS 3.1MEDIUM 6.1

See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences