Home/CVE/Handlebars before 3.0.8 and 4.x before 4.5.3 is vulnerable to Arbitrary Code Execution. The lookup helper fails to prope
CVE

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 prope

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).

HIGH · CVSS 8.1 EPSS 0.00343
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-94Improper Control of Generation of Code ('Code Injection')
▤

Affected Products & Versions

2
handlebarsjs handlebars< 3.0.8
handlebarsjs handlebars>= 4.0.0 and < 4.5.3
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm handlebars HIGH fixed in 3.0.8
⚠

Public Exploits & PoCs

1
pocwww.npmjs.com · 1316www.npmjs.com
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD30 Sep 2020 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L
⚑

Vendor Advisories

4
rhsaRHSA-2021:3917Moderate
rhsaRHSA-2023:1334Important
rhsaRHSA-2021:2500Moderate
rhsaRHSA-2020:5179Moderate
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534478Third Party Advisory
https://www.npmjs.com/advisories/1324Third Party Advisory
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