lib/handlebars/runtime.js Handlebars Template Access Confidential Data Compromise

The vulnerability of the resolvePartial function in the lib/handlebars/runtime.js component, a tool for creating Handlebars templates, is related to the lack of security measures for protecting the structure of web pages. Exploiting this vulnerability could allow an attacker to gain access to...

CVE-2026-33916

A flaw was found in Handlebars. The resolvePartial function in the Handlebars runtime does not properly guard against prototype-chain traversal when resolving partial names. This allows an attacker to inject malicious code into web pages. When Object.prototype has been polluted with a string valu...

CVE-2026-33940

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, a crafted object placed in the template context can bypass all conditional guards in "resolvePartial" and cause "invokePartial" to return "undefined". The Handlebars runtime then treats...

CVE-2026-33916

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...

CVE-2026-33940: Improper Control of Generation of Code

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, a crafted object placed in the template context can bypass all conditional guards in resolvePartial and cause invokePartial to return undefined. The Handlebars runtime then treats the...

handlebars security vulnerabilities

Handlebars is a semantic web template system. Versions of Handlebars 4.7.8 and earlier contain security vulnerabilities. These vulnerabilities stem from the resolvePartial function, which does not prevent prototype chain traversal. This can lead to prototype pollution, thereby enabling...

handlebars security vulnerabilities

Handlebars is a semantic web template system. Versions of Handlebars 4.7.8 and earlier contain security vulnerabilities. These vulnerabilities stem from the ability for custom objects to bypass all conditional protections in resolvePartial, allowing attackers to execute arbitrary commands and...

CVE-2026-33916: Improper Neutralization of Input During Web Page Generation

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...

Prototype Pollution

Overview org.webjars.npm:handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Prototype Pollution via the resolvePartial function. An attacker can inject malicious scripts into rendered output by polluting Object.prototype with a key...

PT-2026-28566

Name of the Vulnerable Software and Affected Versions Handlebars versions 4.0.0 through 4.7.8 Description Handlebars is a templating engine that allows users to build semantic templates. Versions 4.0.0 through 4.7.8 contain a flaw in the resolvePartial function within the Handlebars runtime. This...