CVE-2026-33916

CVE-2026-33916 · Handlebars.js has Prototype Pollution Leading to XSS through Partial Template Injection

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Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.

CVSS 4.7 · Moyenne · EPSS 0,3% · Correctif disponible

Publication

2026-03-27T21:00:48.624Z

Mise à jour

2026-03-30T15:41:36.977Z

Pile logicielle: system · node

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