CVE-2019-20920

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).

Published: Sep 30, 2020
Updated: May 9, 2024
CVE: CVE-2019-20920
GHSA: GHSA-3cqr-58rm-57f8
Severity: High
Exploit:

CVSS v3:

Severity: High
Score: 8.1
AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L

CVSS v2:

Severity: Medium
Score: 6.8
AV:N/AC:M/Au:N/C:P/I:P/A:P

CWEs:

CWE-94

Affected Software
References

Software	From	Fixed in
handlebarsjs / handlebars	4.0.0	4.5.3
handlebarsjs / handlebars	-	3.0.8
wycats / handlebars	-	3.0.8
wycats / handlebars	4.0.0	4.5.3

https://github.com/handlebars-lang/handlebars.js/commit/d54137810a49939fd2ad01a91a34e182ece4528e
https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534478
https://www.npmjs.com/advisories/1316
https://www.npmjs.com/advisories/1324
https://www.npmjs.com/package/handlebars

Vulnerability Database

289,697

CVE-2019-20920