CVE-2021-28174Network attack vector

Account impersonation via unverified URL parameters

Published Apr 8, 2021 · Updated Sep 16, 2024

Broken authentication in Mitake Smart Stock Selection System 2020/06/23 and earlier allows remote attackers to impersonate users via URL parameters. The mobile-ordering module accepts modified URL parameters without verifying that the requester owns the referenced account, then applies that user's privileges. No login or user interaction is required; exposure includes reading another user's transaction records and submitting trades as that user.

CVSS severity6.5
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken authentication in Mitake Smart Stock Selection System 2020/06/23 and earlier allows remote attackers to impersonate users via URL parameters. The mobile-ordering module accepts modified URL parameters without verifying that the requester owns the referenced account, then applies that user's privileges. No login or user interaction is required; exposure includes reading another user's transaction records and submitting trades as that user.

The record

CVE
CVE-2021-28174
Published
Apr 8, 2021
Updated
Sep 16, 2024
Vendor
Mitake Information Corporation
Product
Mitake Smart Stock Selection System
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=unspecified <=2020/06/23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitake Information Corporation · Mitake Smart Stock Selection Systemversion=unspecified <=2020/06/23

Published CVSS scores

6.4NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
6.5TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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