CVE-2026-3992Public exploitNetwork attack vector

Authenticated schema disclosure via unvalidated property lookup

Published Mar 12, 2026 · Updated Mar 12, 2026

Property injection in Code Genie Serverless Express 4.17.0 through 4.17.1 allows remote authenticated users to enumerate object properties. The Users endpoint parses the filter query parameter as JSON, then utils/dynamodb.ts indexes each result with the unvalidated f.property value, including prototype-chain names. A valid JWT is required; response differences disclose schema and runtime structure without modifying data or interrupting service.

CVSS severity6.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Property injection in Code Genie Serverless Express 4.17.0 through 4.17.1 allows remote authenticated users to enumerate object properties. The Users endpoint parses the filter query parameter as JSON, then utils/dynamodb.ts indexes each result with the unvalidated f.property value, including prototype-chain names. A valid JWT is required; response differences disclose schema and runtime structure without modifying data or interrupting service.

The record

CVE
CVE-2026-3992
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Code Genie
Product
Serverless Express
Classifications
CWE-707, CWE-74
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.17.0
  2. Affected versionversion=4.17.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Code Genie · Serverless Expressversion=4.17.0; version=4.17.1

Published CVSS scores

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-707Improper Neutralization
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Public exploit references

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

Technologies

Your stack

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Your stack

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