Description (CNA)
justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content (e.g., script or style) to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML(..., sanitize=True) path for ordinary parsed HTML: mutating or reusing sanitization policy objects (including exported defaults) could weaken later sanitization; programmatic DOM input to sanitize()/sanitize_dom() could miss mixed-case tag names (e.g., ScRiPt, StYlE); crafted programmatic doctype names could serialize into active markup; and custom policies preserving SVG or MathML could allow animation elements, presentation attributes with external url(...) references, or DOM trees mislabeled as namespace="html" to bypass foreign-content checks. Fixed in 1.16.0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| EmilStenstrom / justhtml | affected 0 before 1.16.0; unaffected 1.16.0 |
CWE
CWE-20
References
- https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-4p64-v8f5-r2gx
- https://www.vulncheck.com/advisories/justhtml-before-multiple-security-issues-via-sanitization
ADP enrichment
No English description supplied.
No references supplied.