What is CVE-2026-46628?

CVE-2026-46628 is a medium-severity vulnerability in Symfony Twig, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2026-07-14.

How severe is CVE-2026-46628?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Symfony Twig

CVE-2026-46628

Twig is a template language for PHP. Prior to 3.26.0, the deprecated spaceless filter is registered as safe for HTML, causing Twig autoescaping to emit attacker-controlled markup unescaped when spaceless is applied to untrusted input. This issue is fixed in version 3.26.0.

Published 2026-07-14 · last modified 2026-07-16.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (21.0th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Symfony Twig
Twigphp Twig — versions < 3.26.0

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

github.com/twigphp/Twig/security/advisories/GHSA-4j38-f5cw-54h7 (Vendor Advisory)
github.com/twigphp/Twig/commit/3190b9ae12614dfd58cc5d8f394bac4708b17913 (Patch)
github.com/twigphp/Twig/releases/tag/v3.26.0 (Release Notes)

Frequently asked questions

What is CVE-2026-46628?: CVE-2026-46628 is a medium-severity vulnerability in Symfony Twig, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2026-07-14.
How severe is CVE-2026-46628?: Medium severity. CVSS v3 base score is 5.4 out of 10.