# CVE-2026-93764: Plaintext storage of encrypted fields via skipped embedded models in encryption schema generation

> Mongoid may store encrypted fields in plaintext if embedded models are skipped, exposing sensitive data to anyone with database access.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 21 Sep 2026
- **Also known as:** GHSA-p3g7-qcr8-3pgm

## What is CVE-2026-93764?

CVE-2026-93764 is a high-severity vulnerability in MongoDB Inc. Mongoid, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Mongoid may omit encryption rules for fields declared on embedded models when generating the client-side field-level encryption schema. Applications that enable this feature can therefore store values intended to be encrypted in readable form, with no error or warning. A party with routine read access to the database, a backup, or the underlying data files may then see data that was meant to remain unreadable outside the application.

Weakness: CWE-312 (Cleartext Storage of Sensitive Information)

## Which versions are affected by CVE-2026-93764?

It affects 1 product.


Products: Mongodb Mongoid.

## How do I fix CVE-2026-93764?

No fix has been published for CVE-2026-93764 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93764 being exploited?

There is no known exploitation of CVE-2026-93764 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-2026-93759](https://insights.sbomify.com/CVE-2026-93759/): Server-side JavaScript injection via string query criteria bypassing the strict operator allowlist (high 8.8)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93764 and fix it if it is affected.

What it is: CVE-2026-93764 is a high-severity vulnerability in MongoDB Inc. Mongoid, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93764 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-2026-93764/ (Markdown: https://insights.sbomify.com/CVE-2026-93764/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93764
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93764
- OSV: https://osv.dev/vulnerability/CVE-2026-93764

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93764/
Summaries are generated and may contain mistakes; the official description above is the record.