GetGrav up to 2.0.19 Twig Sandbox Policy Grav/Common/Assets addJs cross site scripting

Summaryinfo

A vulnerability was found in GetGrav Grav up to 2.0.19. It has been classified as problematic. This affects the function addJs of the file Grav/Common/Assets of the component Twig Sandbox Policy. The manipulation leads to cross site scripting. This vulnerability is documented as CVE-2026-86197. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in GetGrav Grav up to 2.0.19. This issue affects the function addJs of the file Grav/Common/Assets of the component Twig Sandbox Policy. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-86197 since 09/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 2.0.20 eliminates this vulnerability.

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Productinfo

Vendor

• GetGrav

Name

• Grav

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7
• 2.0.8
• 2.0.9
• 2.0.10
• 2.0.11
• 2.0.12
• 2.0.13
• 2.0.14
• 2.0.15
• 2.0.16
• 2.0.17
• 2.0.18
• 2.0.19

Website

• Product: https://github.com/getgrav/grav/

CPE 2.3info

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CPE 2.2info

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