CVE-2026-46637: twig Improper Encoding — Fix

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.

Is your site exposed to CVE-2026-46637?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-116 CWE-116

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
symfony	twig	< 3.26.0

References

Advisories & Patches

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

Other References

https://github.com/twigphp/Twig/releases/tag/v3.26.0

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-46637? +

CVE-2026-46637 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-46637? +

CVE-2026-46637 affects products from symfony, specifically: twig. Check the affected products table above for specific version ranges.

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.

Related Vulnerabilities

CVE-2026-45570

go-git is an extensible git implementation library written in pure Go. Prior to 5.19.1 and 6.0.0-alpha.4, go-git's SSH transport constructs …

CVE-2025-1795

During an address list folding when a separating comma ends up on a folded line and that line is to …

CVE-2025-32072

Improper Encoding or Escaping of Output vulnerability in The Wikimedia Foundation Mediawiki Core - Feed Utils allows WebView Injection.This issue …

CVE-2025-32078

Improper Encoding or Escaping of Output vulnerability in The Wikimedia Foundation Mediawiki - Version Compare Extension allows Cross-Site Scripting (XSS).This …

CVE-2025-1308

A vulnerability exists in PX Backup whereby sensitive information may be logged under specific conditions.

CVE-2025-34141

A reflected cross-site scripting (XSS) vulnerability exists in ETQ Reliance CG (legacy) platform within the `SQLConverterServlet` component. This vulnerability requires …

CVE-2026-46637