# CVE-2026-93759: Server-side JavaScript injection via string query criteria bypassing the strict operator allowlist

> Attackers can inject server-side JavaScript into Mongoid queries, leading to data disclosure and potential code execution on the database.

- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 21 Sep 2026
- **Also known as:** GHSA-vr6j-ghpr-hmgf

## What is CVE-2026-93759?

CVE-2026-93759 is a high-severity code injection vulnerability in MongoDB Inc. Mongoid, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mongoid does not neutralize a string-typed query criterion supplied to its query builder, and instead passes it to the database as a server-side JavaScript expression. An unauthenticated party able to influence the value an application supplies as a query argument may cause code of their choosing to be evaluated by the database engine. This may result in unintended disclosure of stored field values, unintended selection of documents for application-initiated writes, and reduced database performance.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-93759?

It affects 1 product.


Products: Mongodb Mongoid.

## How do I fix CVE-2026-93759?

No fix has been published for CVE-2026-93759 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93759 being exploited?

There is no known exploitation of CVE-2026-93759 in the wild and no public exploit code.

## Other vulnerabilities in MongoDB Inc. Mongoid

- [CVE-2026-93762](https://insights.sbomify.com/CVE-2026-93762/): Data deletion and attribute disclosure via field-name method injection in in-memory queries (critical 9.2)
- [CVE-2026-93761](https://insights.sbomify.com/CVE-2026-93761/): Denial of service via unbounded regex matching in Mongoid's in-memory query matcher (high 8.7)
- [CVE-2026-93758](https://insights.sbomify.com/CVE-2026-93758/): Cross-principal document update, theft, and deletion via unvalidated id in nested attributes (high 8.6)
- [CVE-2026-93760](https://insights.sbomify.com/CVE-2026-93760/): NoSQL injection of JavaScript-executing query operators via unsafe-by-default operator guard (high 8.3)
- [CVE-2026-93765](https://insights.sbomify.com/CVE-2026-93765/): Document deletion and process crash via unvalidated method-name dispatch in atomic pop operation (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93759 and fix it if it is affected.

What it is: CVE-2026-93759 is a high-severity code injection vulnerability in MongoDB Inc. Mongoid, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93759 in the wild and no public exploit code.

Affected product: MongoDB Inc. Mongoid. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-93759/ (Markdown: https://insights.sbomify.com/CVE-2026-93759/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93759
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93759
- OSV: https://osv.dev/vulnerability/CVE-2026-93759

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-93759/
Summaries are generated and may contain mistakes; the official description above is the record.