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GaroonApplication · Cybozu

CVE-2021-20774

MEDIUM · 5.4 CVSS v3.1 Published 2021-08-18
Fix available
A fix is available. Upgrade to after 5.5.0 or later.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Cross-site scripting vulnerability in some functions of E-mail of Cybozu Garoon 4.0.0 to 5.5.0 allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Cross-site scripting (XSS) vulnerability in the E-mail function of Cybozu Garoon versions 4.0.0 through 5.5.0 allows a remote authenticated attacker to inject arbitrary JavaScript or HTML into email content, potentially leading to session hijacking, credential theft, or malicious actions performed in the context of other users' sessions.

MitigationApply the vendor patch by updating Cybozu Garoon to version 5.5.1 or later. If immediate patching is not possible, implement input validation and output encoding for email-related functions at the web application firewall (WAF) level as a temporary measure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
GaroonApplication
Affected:>= 4.0.0, <= 5.5.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Cybozu Garoon version
    Log into the Garoon system administration console and navigate to System Settings > System Information to view the installed version number. Alternatively, check the version info in the installation directory or startup screen.
    Affected if The displayed version falls between 4.0.0 and 5.5.0 inclusive.
  2. Verify email function is enabled
    In the Garoon admin interface, go to Application Settings > E-mail (or Mail) and confirm the email module is activated and configured for the organization.
    Affected if The E-mail function is enabled and users can compose or receive emails through Garoon.
  3. Confirm version is within affected range
    Compare the identified version from step 1 against the vulnerable range: versions 4.0.0 through 5.5.0 are affected. Versions prior to 4.0.0 or at 5.5.1 and later are not vulnerable.
    Affected if The installed version is 4.0.0, 4.0.1, 4.2.x, 4.4.x, 5.0.x, 5.2.x, 5.4.x, or 5.5.0.

You are affected if Cybozu Garoon version 4.0.0 through 5.5.0 is installed AND the E-mail function is enabled and accessible to users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 5.5.0
Interim mitigation

Apply the vendor patch by updating Cybozu Garoon to version 5.5.1 or later. If immediate patching is not possible, implement input validation and output encoding for email-related functions at the web application firewall (WAF) level as a temporary measure.

Recommended fix Moderate confidence

Garoon 5.5.1 or later

  1. 1. Identify your current Garoon version by accessing the system administration screen.
  2. 2. Download the latest version of Garoon from the official Cybozu download page or contact Cybozu support.
  3. 3. Backup your current Garoon database and configuration files before proceeding.
  4. 4. Stop the Garoon services on your server.
  5. 5. Install the updated Garoon version (version 5.5.1 or later).
  6. 6. Restart Garoon services and verify the application is running correctly.
  7. 7. Test the E-mail function to ensure it operates normally after the update.
  8. 8. Verify that the XSS vulnerability is resolved by confirming that scripts cannot be injected via E-mail functions.
Caveat Review release notes for any configuration changes or database migration requirements between your current version and the target version.

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Garoon Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA4.0 h
20.0 hours of engineering $3,560
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,696.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-20774 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data