CVE-2026-22888Network attack vector

Portal access denial via extra settings values

Published Feb 2, 2026 · Updated Feb 2, 2026

Improper input verification in Cybozu Garoon 5.0.0 through 6.0.3 allows remote authenticated users to block portal access. The Portal settings handler accepts extra submitted values without rejecting them and applies unauthorized configuration changes; Cybozu withholds reproduction details. Administrative privileges are required, and the resulting stored changes can make Garoon inaccessible without a reported confidentiality impact.

CVSS severity6.9
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input verification in Cybozu Garoon 5.0.0 through 6.0.3 allows remote authenticated users to block portal access. The Portal settings handler accepts extra submitted values without rejecting them and applies unauthorized configuration changes; Cybozu withholds reproduction details. Administrative privileges are required, and the resulting stored changes can make Garoon inaccessible without a reported confidentiality impact.

The record

CVE
CVE-2026-22888
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
Cybozu
Product
Garoon
Classifications
CWE-231, T1565.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 2, 2026Record 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=5.0.0 to 6.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Cybozu · Garoonversion=5.0.0 to 6.0.3

Published CVSS scores

4.9JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
6.9JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-231Improper Handling of Extra Values
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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