CVE-2026-93765Network attack vector

Record deletion and hangs via unsafe reflection

Published Sep 18, 2026 · Updated Sep 18, 2026

Unsafe reflection in MongoDB Mongoid 8.0.0 through 9.1.0 allows remote attackers to delete stored records via crafted update keys. The atomic pop persistence path treats an externally supplied field key as a method name and dispatches an unintended internal method instead of updating an array field. Exploitation requires an embedding application to pass unauthenticated input keys into that operation; successful calls can remove records or leave the application process unresponsive.

CVSS severity8.3
High
EPSS probability0.51%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe reflection in MongoDB Mongoid 8.0.0 through 9.1.0 allows remote attackers to delete stored records via crafted update keys. The atomic pop persistence path treats an externally supplied field key as a method name and dispatches an unintended internal method instead of updating an array field. Exploitation requires an embedding application to pass unauthenticated input keys into that operation; successful calls can remove records or leave the application process unresponsive.

The record

CVE
CVE-2026-93765
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
MongoDB
Product
Mongoid
Classifications
CWE-470, CAPEC-138, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0.0 <=8.0.12
  2. Affected versionversion=8.1.0 <=8.1.12
  3. Affected versionversion=9.0.0 <=9.0.11
  4. Affected versionversion=9.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MongoDB · Mongoidversion=8.0.0 <=8.0.12; version=8.1.0 <=8.1.12; version=9.0.0 <=9.0.11; version=9.1.0

Published CVSS scores

8.3National Vulnerability DatabaseCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CAPEC-138Reflection Injection
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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