CVE-2026-46637: Improper Encoding

Description

Twig is a template language for PHP. Prior to 3.26.0, several filters in twig/markdown-extra and twig/cssinliner-extra are registered with is_safe => [all], causing Twig to treat plain text or HTML output as safe in HTML, JavaScript, CSS, URL, and other contexts where the output is not properly escaped. This issue is fixed in version 3.26.0.

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Weakness Type (CWE)

CWE-116 CWE-116

References

Other References

https://github.com/twigphp/Twig/commit/84982072c79a7417b0d158a401d91344f3658299 https://github.com/twigphp/Twig/commit/e36489d3521ecbfc08bdcc61294302557035f14a https://github.com/twigphp/Twig/releases/tag/v3.26.0 https://github.com/twigphp/Twig/security/advisories/GHSA-jv8m-2544-3pg3

Frequently Asked Questions

What is CVE-2026-46637? +

Twig is a template language for PHP. Prior to 3.26.0, several filters in twig/markdown-extra and twig/cssinliner-extra are registered with is_safe => [all], causing Twig to treat plain text or HTML output as safe in HTML, JavaScript, CSS, URL, and other contexts where the output is not properly escaped. This issue is fixed in version 3.26.0.

How do I check if I'm vulnerable to CVE-2026-46637? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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