CVE-2026-4171Public exploitNetwork attack vector

Cross-account todo-list access via missing ownership checks

Published Mar 15, 2026 · Updated Mar 15, 2026

Improper authorization in Code Genie serverless-express 4.17.0 and 4.17.1 allows remote authenticated users to access other users' todo lists. The Lambda Function URL example omits userId ownership from the TodoList schema and handles GET, PUT, and DELETE requests using only a supplied listId. Exploitation requires a valid account and another user's UUIDv4 listId, after which list contents can be read, changed, or deleted.

CVSS severity6.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Code Genie serverless-express 4.17.0 and 4.17.1 allows remote authenticated users to access other users' todo lists. The Lambda Function URL example omits userId ownership from the TodoList schema and handles GET, PUT, and DELETE requests using only a supplied listId. Exploitation requires a valid account and another user's UUIDv4 listId, after which list contents can be read, changed, or deleted.

The record

CVE
CVE-2026-4171
Published
Mar 15, 2026
Updated
Mar 15, 2026
Vendor
Code Genie
Product
Serverless Express
Classifications
CWE-639, CWE-285, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 15, 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

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-285Improper Authorization
T1190Exploit Public-Facing Application

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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