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OfficeApplication · Cybozu

CVE-2021-20628

MEDIUM · 6.1 CVSS v3.1 Published 2021-03-18
Fix available
A fix is available. Upgrade to after 10.8.4 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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 Address Book of Cybozu Office 10.0.0 to 10.8.4 allows remote attackers to inject an arbitrary script via unspecified vectors. Note that this vulnerability occurs only when using Mozilla Firefox.

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 Address Book of Cybozu Office versions 10.0.0 through 10.8.4 allows remote attackers to inject arbitrary script via unspecified vectors. The vulnerability is triggered only when users access the application through Mozilla Firefox.

MitigationUpgrade Cybozu Office to version 10.8.5 or later where the vendor has patched the vulnerability, or implement output encoding and input validation specifically for the Address Book component.

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
OfficeApplication
Affected:>= 10.0.0, <= 10.8.4

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
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/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 Office version
    Access the system administration panel or check the installation directory for the version file. Common paths include the admin console or the 'version' file in the installation directory.
    Affected if The installed version is 10.0.0, 10.1.0, 10.2.0, 10.3.0, 10.4.0, 10.5.0, 10.6.0, 10.7.0, 10.8.0, 10.8.1, 10.8.2, 10.8.3, or 10.8.4.
  2. Confirm Address Book module is accessible
    Log into Cybozu Office as an administrator and navigate to the Address Book module. Verify the module is enabled and accessible to users.
    Affected if The Address Book module is active and users have permissions to view or manage address entries.
  3. Determine browser environment
    Review user access patterns or check logs for Mozilla Firefox as the browser client when accessing the Address Book.
    Affected if Users access Cybozu Office via Mozilla Firefox browser.

You are affected if Cybozu Office version is 10.0.0 through 10.8.4 AND the Address Book module is accessible to users accessing the application through Mozilla Firefox.

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.

From vendor data
Upgrade available Upgrade to a release after 10.8.4
Interim mitigation

Upgrade Cybozu Office to version 10.8.5 or later where the vendor has patched the vulnerability, or implement output encoding and input validation specifically for the Address Book component.

Fix this in Office Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.

Scan for this in your stack

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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-2021-20628 in production — separate from our analysis above.

No notes yet

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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