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Arbitrary Code Execution in Handlebars

High severity GitHub Reviewed Published Feb 10, 2022 to the GitHub Advisory Database • Updated Nov 29, 2023

Package

npm handlebars (npm)

Affected versions

< 3.0.8
>= 4.0.0, < 4.5.3

Patched versions

3.0.8
4.5.3

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).

References

Published by the National Vulnerability Database Sep 30, 2020
Reviewed Apr 22, 2021
Published to the GitHub Advisory Database Feb 10, 2022
Last updated Nov 29, 2023

Severity

High
8.1
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L

Weaknesses

CVE ID

CVE-2019-20920

GHSA ID

GHSA-3cqr-58rm-57f8

Source code

No known source code
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