CVE-2026-65900
MEDIUM
6.1
CVSS 3.1
Description
DOMPurify versions >=3.0.0 and before 3.4.8, when configured with SAFE_FOR_TEMPLATES together with a DOM output mode (RETURN_DOM, RETURN_DOM_FRAGMENT, or IN_PLACE), fail to strip template expressions (e.g. ${evil}, {{evil}}, <%evil%>) inside <template> element content. The final normalization/scrub pass (_scrubTemplateExpressions) uses a NodeIterator and node.normalize() that do not descend into template.content, so expressions that only form after adjacent text nodes merge survive sanitization. This bypasses SAFE_FOR_TEMPLATES and can allow a downstream template engine to evaluate attacker-supplied expressions. The string output path is not affected.
Metadata
Severity & Metrics
6.1
MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| cure53 | DOMPurify | — | 3.0.0 < 3.4.8, 3.4.8 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-79 | cna | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') |
CVSS scores (2)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 6.1 | MEDIUM | 3.1 | cna | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| 5.1 | MEDIUM | 4.0 | cna | 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 |
References (2)
- GitHub Security Advisory (GHSA-gvmj-g25r-r7wr) https://github.com/cure53/DOMPurify/security/advisories/GHSA-gvmj-g25r-r7wr
- VulnCheck Advisory: DOMPurify before 3.4.8 Template Expression Injection via RETURN_DOM https://www.vulncheck.com/advisories/dompurify-before-template-expression-injection-via-return-dom