CVE-2019-20920Handlebars before 3.0.8 and 4.x before 4.5.3 is vulnerable to Arbitrary Code Execution.
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No exploitation reported and no EPSS estimate yet.
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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
- 8.1 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
handlebarsjs handlebars handlebarsjs:handlebars | before 3.0.8; from 4.0.0 before 4.5.3 | NVD |
References
- https://www.npmjs.com/advisories/1316x-refsource-misc
- https://www.npmjs.com/advisories/1324x-refsource-misc
- https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534478x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.