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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 在生成客户端字段级加密 Schema 时，可能会遗漏嵌入模型中声明的字段加密规则。因此，启用了此功能的应用程序可能会将以加密形式存储的值以可读形式保存，且不会引发任何错误或警告。这样，对数据库、备份或底层数据文件拥有常规读取权限的人员，可能会看到本应仅在应用外部保持不可读的数据。

CVSS 6.5 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1566 · Phishing

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