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CVE-2019-20920Published

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 ru…

Exact source revision recorded 24 Oct 2026 15:17:33 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

nvd · CVE-2019-20920

Published

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).

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Modified

Weakness classifications: CWE-94

Original publisher date fields

published: 2020-09-30T18:15:17.927

lastModified: 2026-10-08T22:16:54.603

1 source CPE criteria · context only
  • cpe:2.3:a:handlebarsjs:handlebars:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published
30 Sep 2020 18:15:17 UTC
Source modified
8 Oct 2026 22:16:54 UTC
Observed here
24 Oct 2026 15:17:33 UTC
Source terms
NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Primary · 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L

CVSS 2.0 · [email protected] · Primary · 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

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Sources read 10 Nov 14:45 UTC · 275 of 275 readable · 274 fully read · documentation 469/469 current

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