CVE-2019-20920

HighCVSS 8.1/10Last modified Oct 8, 2026

Description

Handlebars before 3.0.8 and 4.x before 4.5.3 is vulnerable to Arbitrary Code Execution. The lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript. This can be used to run arbitrary code on a server processing Handlebars templates or in a victim's browser (effectively serving as XSS).

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L

Weakness enumeration

CWE-94

Affected software

No affected versions have been published.

Timeline

Published: Sep 30, 2020
Last modified: Oct 8, 2026
NVD status: Modified

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