sift 17.1.3 Prototype Pollution Remote Code Execution via $where

sift (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. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.

• RCE без входа
• Prototype pollution

Опубликовано

4 сент. 2026 г.

Обновлено

14 сент. 2026 г.

EPSS

0,7 % · 53-й процентиль

CWE

CWE-1321