CVE-2026-86197

Medium

Description

Grav before 2.0.20 contains a cross-site scripting vulnerability in the Twig sandbox policy that allowlists addJs and addCss methods on Grav\Common\Assets without proper output escaping. Page editors can inject arbitrary script by registering malicious assets or injecting attributes, which are rendered unescaped into document head tags and executed for all visitors including administrators.

SeverityMedium

CVSS5.1

Exploit probability—

ProductGetgrav/grav

PublishedSep 5, 2026

First seenSep 5, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

getgrav/grav2.0.20 or later

Vendor advisories

github.com/getgrav/grav/security/advisories/GHSA-8hgv-xc77-jmcr

Affected products

Product	Affected versions	Fixed in
getgrav/gravPackagist	v < 2.0.20	2.0.20

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