CVE-2022-27807Network attack vector

Category-creation denial via improperly validated Link input

Published Jul 4, 2022 · Updated Aug 3, 2024

Improper input validation in Link in Cybozu Garoon 4.0.0 through 5.5.1 allows remote authenticated users to prevent Categories from being added. The vendor and JVN identify Link category creation as the affected locus but do not disclose which field is validated incorrectly or how the input causes the persistent failure. Any user who can log in can trigger the condition over the network, and the documented consequence is limited to making category creation unavailable.

CVSS severity4.3
Medium
EPSS probability0.70%
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 Link in Cybozu Garoon 4.0.0 through 5.5.1 allows remote authenticated users to prevent Categories from being added. The vendor and JVN identify Link category creation as the affected locus but do not disclose which field is validated incorrectly or how the input causes the persistent failure. Any user who can log in can trigger the condition over the network, and the documented consequence is limited to making category creation unavailable.

The record

CVE
CVE-2022-27807
Published
Jul 4, 2022
Updated
Aug 3, 2024
Vendor
Cybozu
Product
Garoon
Classifications
CWE-20, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 2022CVE 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 5.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybozu · Garoonversion=4.0.0 to 5.5.1

Published CVSS scores

4.0JPCERT/CCAV:N/AC:L/Au:S/C:N/I:N/A:P
4.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

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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