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CVE-2026-6827 - justhtml before 1.17.0 Multiple Cross-Site Scripting Vulnerabilities

CVE ID : CVE-2026-6827 Published : Aug. 23, 2026, 2:16 p. m. • 2 hours, 54 minutes ago Description : justhtml before 1. 17. 0 contains multiple security issues in sanitization, serialization, and programmatic DOM handling. When custom policies preserve foreign namespaces (SVG/MathML), dangerous content such as HTML integration points (SVG , MathML ) and mutation-XSS parser-differential payloads could survive sanitization and become active HTML after reparse; SVG filter="url(...) " and preserved could leave resource-loading CSS (@import, background-image:url()). Programmatic script/style/Comment nodes could serialize into active markup. Additional hardening fixes address sanitize-pipeline cache mutation and DOM parent/child cycles that could cause infinite loops. Most issues affect advanced or custom configurations rather than the default JustHTML(... , sanitize=True) safe path.

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