CVE-2026-85625 sift 17.1.3 Prototype Pollution Remote Code Execution via $where
Attackers can execute arbitrary JavaScript via prototype pollution or untrusted queries in sift.js due to unsafe $where operator handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85625?
CVE-2026-85625 is a critical code injection vulnerability in crcn sift.js, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-85625?
How do I fix CVE-2026-85625?
No fix has been published for CVE-2026-85625 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-85625 being exploited?
There is no known exploitation of CVE-2026-85625 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-8pfg-3p4c-36vm.