CVE-2021-23383Medium· 5.6▾ TwilightPoC availableThe package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 30.8 · likelihood 0.9 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
4.5%
2 GitHub repos (last check)
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.
handlebars < 4.7.7e-series_performance_analyzerUpgrade past the affected range:
handlebars 4.7.7Connected by shared product, vendor, weakness, or advisory.
CVE-2021-23369Medium· 5.6The package handlebars before 4.7.7 are vulnerable to Remote Code Execution (RCE) when selecting certain compiling options to compile templates coming from an untrusted source.
CVE-2026-33937Critical· 9.8Handlebars provides the power necessary to let users build semantic templates
CVE-2026-33938High· 8.1Handlebars provides the power necessary to let users build semantic templates
CVE-2020-5258High· 7.7In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution
CVE-2026-104849Critical· 9.5Tinypool is a minimal Node.js worker thread pool implementation
CVE-2026-85625High· 8.1sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where