CVE-2026-116804
Description
A flaw was found in DOMPurify. When configured to sanitize content for template engines, DOMPurify fails to properly scrub template expressions within attached shadow roots. A remote attacker can exploit this flaw by supplying crafted markup with expressions split across disallowed elements, which recombine after the invalid tags are removed. When the application subsequently evaluates the sanitized content in a downstream template engine, this can lead to cross-site scripting (XSS) or template injection.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires non-default sanitization configurations, specifically pairing template safety features with DOM-returning output modes, alongside passing untrusted input directly into downstream template interpreters. In typical Red Hat product deployments, applications do not routinely process untrusted shadow DOM trees through template evaluators under this configuration. Consequently, the flaw presents limited exposure under standard operational settings.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.1 | N/A | 6.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Changed | N/A | Changed |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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