CVE-2020-5563Network attack vector

Unauthenticated data disclosure via field-selection API

Published Apr 28, 2020 · Updated Aug 4, 2024

Improper authentication in Cybozu Garoon 4.0.0 through 4.10.3 allows remote attackers to obtain product data through its API. The authentication bypass affects the API used to specify fields, but Cybozu and JVN have not disclosed the faulty authentication operation or request details. Network access to the affected API is sufficient; no credentials or user interaction are required, and the documented impact is data disclosure only.

CVSS severity5.3
Medium
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Cybozu Garoon 4.0.0 through 4.10.3 allows remote attackers to obtain product data through its API. The authentication bypass affects the API used to specify fields, but Cybozu and JVN have not disclosed the faulty authentication operation or request details. Network access to the affected API is sufficient; no credentials or user interaction are required, and the documented impact is data disclosure only.

The record

CVE
CVE-2020-5563
Published
Apr 28, 2020
Updated
Aug 4, 2024
Vendor
Cybozu
Product
Garoon
Classifications
CWE-287, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=4.0.0 to 4.10.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cybozu · Garoonversion=4.0.0 to 4.10.3

Published CVSS scores

5.0JPCERT/CCAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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
T1213Data from Information Repositories

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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Your stack

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