CVE-2020-5565Network attack vector

Authenticated data alteration via input validation bypass

Published Apr 28, 2020 · Updated Aug 4, 2024

Improper input validation in Cybozu Garoon 4.0.0 through 4.10.3 allows remote authenticated users to alter Workflow and MultiReport data. The applications accept input that bypasses validation, but Cybozu and JVN have not disclosed the responsible function, parameter, or failed check. A valid account and network access to the affected applications are required, and the documented consequence is modification of their application data.

CVSS severity4.3
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Cybozu Garoon 4.0.0 through 4.10.3 allows remote authenticated users to alter Workflow and MultiReport data. The applications accept input that bypasses validation, but Cybozu and JVN have not disclosed the responsible function, parameter, or failed check. A valid account and network access to the affected applications are required, and the documented consequence is modification of their application data.

The record

CVE
CVE-2020-5565
Published
Apr 28, 2020
Updated
Aug 4, 2024
Vendor
Cybozu
Product
Garoon
Classifications
CWE-20, T1565.001
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

Cybozu · Garoonversion=4.0.0 to 4.10.3

Published CVSS scores

4.3JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0JPCERT/CC and IPAAV:N/AC:L/Au:S/C:N/I:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
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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Your stack

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