CVE-2026-20711: Cross-site scripting vulnerability exists in E-mail function of Cybozu Garoon 5.0.0 to 6.0.3, which may allow

Routine

MEDIUM 6.1UPGRADE

CVE-2026-20711 is a medium-severity flaw (CVSS 6.1) affecting garoon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting vulnerability exists in E-mail function of Cybozu Garoon 5.0.0 to 6.0.3, which may allow an attacker to reset arbitrary users’ passwords.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-79
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 10:17 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-2026-20711?

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

Is CVE-2026-20711 being exploited?

CVE-2026-20711 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-2026-20711 affect?

CVE-2026-20711 affects garoon. Severity is medium (CVSS 6.1). Cross-site scripting vulnerability exists in E-mail function of Cybozu Garoon 5.0.0 to 6.0.3, which may allow an attacker to reset arbitrary users’ passwords.

How urgent is CVE-2026-20711?

Priority 26/100. No elevated risk signals yet.

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References

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