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CRITICAL

CVE-2021-23383

CVSS v3

9.8

CRITICAL

EPSS Score

4.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • handlebarsnpmall versions · fixed in 4.7.7

Vendor advisories

  • CVE-2021-23383 Red Hat Product Security10 products fixed · 22 known affected

    nodejs-handlebars: Remote code execution when compiling untrusted compile templates with compat:true option

    servicemesh-grafana as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana-prometheus as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana.src as a component of OpenShift Service Mesh 2.0

  • RHSA-2023:1334 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Process Automation Manager 7.13.2 security update

  • RHSA-2021:4032 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Openshift Logging 5.2.3 bug fix and security update

  • RHSA-2021:4628 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Openshift Logging 5.1.4 bug fix and security update

  • RHSA-2021:2500 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Enterprise security and bug fix update

Full record on NVD

Description

The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.

Technical details

Published
2021-05-04

Frequently asked questions

What is CVE-2021-23383?

The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.

Is CVE-2021-23383 actively exploited?

Active exploitation of CVE-2021-23383 has not been confirmed. Its EPSS score was 4.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23383?

CVE-2021-23383 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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Same product first, then the same vendor advisory and the same publication week.

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