CVE-2016-4907
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 · uneditedCybozu Garoon 3.0.0 to 4.2.2 allow remote attackers to obtain CSRF tokens 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 confidenceCybozu Garoon versions 3.0.0 through 4.2.2 contain a vulnerability that allows remote attackers to obtain CSRF tokens through unspecified vectors. This enables attackers to potentially bypass CSRF protections and perform unauthorized actions on behalf of authenticated users.
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= 3.0.0= 3.0.1= 3.0.2= 3.0.3= 3.1.0= 3.1.1= 3.1.2= 3.1.3= 3.5.0= 3.5.1= 3.5.2= 3.5.3CVSS 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
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Identify Cybozu Garoon installed versionAccess the system administration panel or check the product information page within Garoon. The version is typically displayed in the 'System Settings' or 'About' section of the administrative interface.Affected if The installed version falls within 3.0.0 to 4.2.2 inclusive.
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Verify CSRF token handling is in useExamine the web application's session management configuration or inspect HTTP requests to confirm that CSRF tokens are being generated and validated for state-changing operations.Affected if CSRF tokens are generated and used by the application, as the vulnerability allows attackers to obtain these tokens.
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Check for anomalous CSRF token exposureReview server logs and network traffic for any unusual requests that may have accessed CSRF token endpoints or parameters. Look for patterns where tokens might be disclosed through logs or error messages.Affected if Tokens are being exposed through logs, error responses, or other unintended channels.
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Confirm authentication is requiredVerify that the Garoon application requires user authentication before allowing privileged actions.Affected if The application authenticates users, as the vulnerability enables unauthorized actions on behalf of authenticated users.
A user is affected if Cybozu Garoon version 3.0.0 through 4.2.2 is running and the application uses CSRF token-based protection, since the flaw allows attackers to obtain tokens and bypass those protections.
Generated from the published advisory. Verify against your own configuration.
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 dataUpgrade to Cybozu Garoon version 4.2.3 or later, which contains the vendor patch for this vulnerability. If immediate patching is not possible, implement additional CSRF protections such as checking the Origin/Referer headers and implementing SameSite cookie attributes.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2016-4907 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2016-4907 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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
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