CVE-2022-28718Network attack vector

Authenticated bulletin data tampering via authorization bypass

Published Jul 4, 2022 · Updated Aug 3, 2024

Improper authorization in Cybozu Garoon 4.0.0 through 5.5.1 allows remote authenticated users to alter Bulletin data. Cybozu and JPCERT/CC identify an operation-restriction bypass in the Bulletin component but do not disclose the request path or failed authorization check. Any user who can log in can modify Bulletin content outside the operations permitted to that account, while no confidentiality or availability impact is reported.

CVSS severity4.3
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Cybozu Garoon 4.0.0 through 5.5.1 allows remote authenticated users to alter Bulletin data. Cybozu and JPCERT/CC identify an operation-restriction bypass in the Bulletin component but do not disclose the request path or failed authorization check. Any user who can log in can modify Bulletin content outside the operations permitted to that account, while no confidentiality or availability impact is reported.

The record

CVE
CVE-2022-28718
Published
Jul 4, 2022
Updated
Aug 3, 2024
Vendor
Cybozu
Product
Garoon
Classifications
CWE-285, T1565.001
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

4.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0JPCERT/CCAV: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 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-285Improper Authorization
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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