CVE-2013-3656
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 Office 9.1.0 and earlier does not properly manage sessions, which allows remote attackers to bypass authentication by leveraging knowledge of a login URL.
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 Office 9.1.0 and earlier contains a session management flaw that allows remote attackers to bypass authentication mechanisms. The vulnerability stems from improper session handling, where knowledge of a login URL alone may be sufficient for an attacker to hijack or forge sessions and gain unauthorized access to the application.
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<= 9.1.0CVSS 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
- M
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- None
AV:N/AC:M/Au:N/C:P/I:P/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 checksWork through these to decide whether this CVE applies to you.
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Identify Cybozu Office versionLocate the installed Cybozu Office version through the administrative interface (typically found in System Settings > System Information) or by checking the product documentation for version detection methods. Compare the installed version against the affected range (9.1.0 and earlier).Affected if The installed version is 9.1.0 or any earlier version
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Confirm application is runningVerify that the Cybozu Office web application is accessible and operational. This vulnerability is exploitable remotely through the web interface, so a running instance is required for the flaw to apply.Affected if Cybozu Office is accessible over HTTP/HTTPS and the version is within the affected range
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Review session configurationIf administrative access is available, examine the session management settings within the Cybozu Office administration panel. Look for session timeout configurations, session ID handling, and whether session fixation protections are enabled.Affected if Session management settings are at default or allow session fixation (attacker-controlled session IDs)
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Check authentication mechanismInspect the login process to determine if session IDs are generated before user authentication or if they remain unchanged before and after login (session fixation vulnerability indicator).Affected if Session ID does not change upon successful authentication or is set prior to login
A user is affected if Cybozu Office version 9.1.0 or earlier is installed and accessible, as the session management flaw allows remote attackers to forge or hijack sessions without additional user credentials.
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 Cybozu Office to a version newer than 9.1.0. If upgrading is not immediately possible, implement additional authentication controls such as IP-based restrictions, two-factor authentication, or web application firewall rules to mitigate the session fixation/hijacking risk.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2013-3656 — 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-2013-3656 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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