What’s Vulnerable › Vulnerabilities

CVE-2026-85625: sift 17.1.3 Prototype Pollution Remote Code Execution via $where

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-14
• Weakness: CWE-1321

Description

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.

Affected products

• crcn sift.js: through 17.1.3

References

• https://github.com/crcn/sift.js
• https://github.com/crcn/sift.js/blob/v17.1.3/src/core.ts
• https://github.com/crcn/sift.js/issues/276
• https://www.vulncheck.com/advisories/sift-17.1.3-prototype-pollution-remote-code-execution-via-where

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