CVE-2019-20920
CVSS v3
8.1
HIGH
EPSS Score
3.2 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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).
Technical details
- Published
- 2020-09-30
Frequently asked questions
What is 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).
Is CVE-2019-20920 actively exploited?
Active exploitation of CVE-2019-20920 has not been confirmed. Its EPSS score was 3.2% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2019-20920?
CVE-2019-20920 has a CVSS v3 base score of 8.1 (HIGH severity).
Is CVE-2019-20920 affecting your environment?
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