SB2026071311 - Improper access control in DOMPurify

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Main Vulnerability Database SB2026071311

SB2026071311 - Improper access control in DOMPurify

Published: July 13, 2026

Security Bulletin ID SB2026071311
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: N/A)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary script code.

The vulnerability exists due to improper access control in the CUSTOM_ELEMENT_HANDLING sanitization logic when processing allowed custom elements. A remote attacker can supply specially crafted HTML content to execute arbitrary script code.

The bypass affects the afterSanitizeElements hook and the payload becomes executable only after a custom element writes sanitized data into innerHTML.


Remediation

Install update from vendor's website.

References