CVE-2019-20920

mediumpriority · track · 33EPSS 0.032 · 88 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

3.15% (88th) EPSS

CVSS 6.8 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-28

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).

cvss

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.1

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:Lprimary · NVD / NIST USexploitability 2.2 · impact 5.3

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:Lsecondary · OSV

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94USprimaryCWE-94US

affected products (5)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
handlebarsjs handlebars< 3.0.8nvdUScpe:2.3:a:handlebarsjs:handlebars:*:*:*:*:*:*:*:*
handlebarsjs handlebars4.0.0 → 4.5.3nvdUScpe:2.3:a:handlebarsjs:handlebars:*:*:*:*:*:*:*:*
npm handlebars< 3.0.8osvUSpkg:npm/handlebars
npm handlebars4.0.0 → 4.5.3osvUSpkg:npm/handlebars

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-3cqr-58rm-57f8Arbitrary Code Execution in Handlebars2022-02-10ghsa · osvUS
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).

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2020-09-30modified 2026-10-08

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+10444 more

references (17)

External citations — patches, advisories, analysis.

scry

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