# CVE-2026-85625

## Summary

- **CVE ID:** CVE-2026-85625
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-1321
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 4, 2026

## 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 (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.55%
- **EPSS Percentile:** 44.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._