CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2019-19919
Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.
Severity
- EPSS
- 7.1% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-31)
- CWE
- CWE-1321
- Published
- Modified
- Record from
- the NVD, synced
Affected
- handlebars.js_project:handlebars.js
- tenable:tenable.sc
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-w457-6q6x-cgp9 | npm | handlebars | >=4.0.0 <4.3.0 | 4.3.0 |
| GHSA-w457-6q6x-cgp9 | RubyGems | bootstrap-wysihtml5-rails | >=0.3.3.5 <=0.3.3.8 | no fix published |
| GHSA-w457-6q6x-cgp9 | npm | handlebars | <3.0.8 | 3.0.8 |