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

Quick assessment

Affected
MongoDB Inc. Mongoid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 6.5 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
MongoDB Inc. Mongoid 9.1.0 affected
9.0.0≤ 9.0.11 affected
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I. Basic Information for CVE-2026-93764

Vulnerability Information
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Vulnerability Title
Plaintext storage of encrypted fields via skipped embedded models in encryption schema generation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文存储
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Inc. Mongoid 9.1.0 -

II. Public POCs for CVE-2026-93764

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III. Intelligence Information for CVE-2026-93764

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Other References for CVE-2026-93764 (1)

Same Patch Batch · MongoDB Inc. · 2026-09-18 · 8 CVEs total

CVE-2026-93762 9.8 CRITICAL Data deletion and attribute disclosure via field-name method injection in in-memory querie
CVE-2026-93765 9.1 CRITICAL Document deletion and process crash via unvalidated method-name dispatch in atomic pop ope
CVE-2026-93759 8.6 HIGH Server-side JavaScript injection via string query criteria bypassing the strict operator a
CVE-2026-93760 8.2 HIGH NoSQL injection of JavaScript-executing query operators via unsafe-by-default operator gua
CVE-2026-93758 8.1 HIGH Cross-principal document update, theft, and deletion via unvalidated id in nested attribut
CVE-2026-93761 7.5 HIGH Denial of service via unbounded regex matching in Mongoid's in-memory query matcher
CVE-2026-93763 6.5 MEDIUM Silent plaintext persistence via unresolved callable database name in encryption schema ma

IV. Related Vulnerabilities

Same product: Mongoid
Same vendor: MongoDB Inc.
Same weakness: CWE-312

V. Comments for CVE-2026-93764

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