CVE-2021-20760Network attack vector

Unauthorized profile modification via improper input validation

Published Aug 18, 2021 · Updated Aug 3, 2024

Improper input validation in Cybozu Garoon 4.0.0 through 5.0.2 allows remote authenticated users to alter User Profile data. The vendor and JVN identify the User Profile component but do not disclose which request field is insufficiently validated or how authorization is bypassed. Any user who can log in can modify profile data beyond that account's assigned privileges; the published impact is limited to data integrity.

CVSS severity4.3
Medium
EPSS probability0.78%
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 5.0.2 allows remote authenticated users to alter User Profile data. The vendor and JVN identify the User Profile component but do not disclose which request field is insufficiently validated or how authorization is bypassed. Any user who can log in can modify profile data beyond that account's assigned privileges; the published impact is limited to data integrity.

The record

CVE
CVE-2021-20760
Published
Aug 18, 2021
Updated
Aug 3, 2024
Vendor
Cybozu
Product
Garoon
Classifications
CWE-20
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 5.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybozu · Garoonversion=4.0.0 to 5.0.2

Published CVSS scores

4.3JPCERT/CC and IPA JVNCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N
4.0JPCERT/CC and IPA JVNAV:N/AC:L/Au:S/C:N/I:P/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

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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

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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