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TI-2026-71160 Aliases CVE-2026-109344GHSA-59fh-8xxf-p69h

Cross-site scripting in DOMPurify IN_PLACE mode hooks

Priority LOW 28CWE-79Published · Updated

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

cure53 DOMPurify from 3.4.13 before 3.4.16 contains a cross-site scripting flaw (CWE-79). IN_PLACE mode does not neutralize subtrees that afterSanitizeElements or afterSanitizeAttributes hooks detach, so on* event handlers in those subtrees stay active on the live DOM. A remote attacker with no privileges can supply markup that runs script in the victim's origin, but the victim must actively interact with the page.

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

Description from the CNA

DOMPurify from 3.4.13 before 3.4.16 contains a cross-site scripting vulnerability because IN_PLACE mode fails to neutralize subtrees detached by afterSanitizeElements or afterSanitizeAttributes hooks. Attackers can supply markup with on* handlers inside a wrapper removed by such hooks, leaving handlers armed on the live DOM to execute script in the victim origin.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00188 8th percentileScored 2026-11-07
Fix Fixed DOMPurify (cure53): 3.4.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
cure53DOMPurify3.4.13 to before 3.4.163.4.16Patch availableCNA
  • DOMPurify Vendorcure53 Affected 3.4.13 to 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.

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

Remediation

Upgrade DOMPurify to version 3.4.16.

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 ·

    cure53 DOMPurify 3.4.16

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-71161 Cross-site scripting in DOMPurify IN_PLACE mode bypasses sanitizationPriority MEDIUM 56
    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

  1. 2026-10-12 Threatist record created from CVE-2026-109344
  2. 2026-10-12 Alias added: GHSA-59fh-8xxf-p69h
  3. 2026-10-13 Affected versions changed · Red Hat
  4. 2026-10-13 CVSS score added · Red Hat
  5. 2026-10-13 CISA SSVC decision points changed

References

Advisory 1

  • 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