CVE-2026-22888: Improper input verification issue exists in Cybozu Garoon 5.0.0 to 6.0.3, which may lead to unauthorized alter

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HIGH 7.5REMOTEUPGRADE

CVE-2026-22888 is a high-severity flaw (CVSS 7.5) affecting garoon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input verification issue exists in Cybozu Garoon 5.0.0 to 6.0.3, which may lead to unauthorized alteration of portal settings, potentially blocking access to the product.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-231
Published	2026-02-02
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: cybozu

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-02 07:16 UTCPublished CVE record published
2026-06-17 10:20 UTCUpdated Record last modified

cybozu garoon UPGRADE

Affected: >= 5.0.0 and < 6.0.3

Fixed in: 6.0.3

Safe to downgrade to: a release before 5.0.0

1. Check installed version

apt-cache policy garoon || rpm -q garoon || garoon --version

2. UPGRADE to 6.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade garoon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade garoon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison garoon sudo apt install garoon=<VERSION_BEFORE_5.0.0> sudo apt-mark hold garoon

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list garoon sudo dnf downgrade garoon-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add garoon

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-22888?

garoon: upgrade to 6.0.3. Exact commands for each OS are on this page.

Is CVE-2026-22888 being exploited?

CVE-2026-22888 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-22888 affect?

CVE-2026-22888 affects garoon. Severity is high (CVSS 7.5). Improper input verification issue exists in Cybozu Garoon 5.0.0 to 6.0.3, which may lead to unauthorized alteration of portal settings, potentially blocking access to the product.

How urgent is CVE-2026-22888?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

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References

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