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Understanding and Defending Against CVE-2026-6827: Multiple Security Issues in justhtml
CVE-2026-6827 is a medium-severity vulnerability in the justhtml library, affecting versions before 1.17.0. It involves multiple security issues in sanitization, serialization, and programmatic DOM handling, potentially allowing for cross-site scripting (XSS) attacks. This analysis provides an in-depth look at the vulnerability, its exploitation mechanics, and defensive strategies.
CVE-2026-5751: justhtml Parser-Differential Cross-Site Scripting Vulnerability
A parser-differential cross-site scripting (mXSS) vulnerability exists in justhtml versions 1.13.0 and earlier. The flaw allows for markup injection when using a custom SanitizationPolicy that preserves foreign namespaces. Update to version 1.14.0 or later to mitigate.
CVE-2026-5389: Cross-Site Scripting Vulnerability in justhtml Library
A cross-site scripting (XSS) vulnerability exists in the justhtml library, specifically in the to_markdown() function, which can be exploited by attackers to execute raw HTML when the generated Markdown is rendered. The vulnerability affects justhtml versions before 1.13.0 and has a CVSS score of 6.1. Organizations should update to version 1.13.0 or later to mitigate this vulnerability.