🛡️ CVE-2021-23383 — handlebars

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-1321 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Prototype Pollution in handlebars

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2021-23383 is classified as CWE-1321: Prototype Pollution. Attacker input can modify an object prototype, changing behaviour for objects across the application.

Affected software

CVE-2021-23383 is recorded against 1 package.

  • handlebars

Timeline and source

Published on 10 February 2022 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)
security.netapp.com (Web)
snyk.io (Web)
snyk.io (Web)
snyk.io (Web)
snyk.io (Web)
www.npmjs.com (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-1321
Public Exploit ✅ No
Source OSV
Published 2022-02-10
Updated 2026-08-12
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
handlebars — —

Exploit Protection

Are you running handlebars?

CVE-2021-23383 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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