Improper Encoding or Escaping of Output Affecting twig/cssinliner-extra package, versions <3.26.0
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Test your applications- Snyk IDSNYK-PHP-TWIGCSSINLINEREXTRA-16875125
- published26 May 2026
- disclosed21 May 2026
- creditClaude Mythos
Introduced: 21 May 2026
NewCVE-2026-46637 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade twig/cssinliner-extra to version 3.26.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output in the html_to_markdown, markdown_to_html, and inline_css filters due to incorrect declaration of output safety. An attacker can inject unescaped HTML or script content by supplying specially crafted input that is processed by these filters and then rendered in a sensitive context, such as within a JavaScript string or URL parameter.