CVE-2023-6839
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 · uneditedDue to improper error handling, a REST API resource could expose a server side error containing an internal WSO2 specific package name in the HTTP response.
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 confidenceThis is an information disclosure vulnerability in WSO2 products where improper error handling in REST API resources causes server-side errors containing internal WSO2 package names to be exposed in HTTP responses. Attackers could use this exposed stack trace information for reconnaissance to understand the internal technology stack.
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= 3.1.0= 3.2.0= 4.0.0CVSS 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
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 WSO2 API Manager installationCheck if the system is running WSO2 API Manager by reviewing installed software, checking process lists for 'wso2' or 'api-manager' processes, or examining web application directories for WSO2-specific artifacts.Affected if The system does not have WSO2 API Manager installed - this CVE only affects WSO2 API Manager.
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Determine installed WSO2 API Manager versionCheck the installed version by reviewing product documentation, checking version files in the installation directory (such as 'product-info.txt' or 'carbon.xml'), or querying the management console for product version information.Affected if The installed version is exactly 3.0.0, 3.1.0, 3.2.0, or 4.0.0 - only these specific versions are affected.
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Test REST API error responses for information disclosureSend malformed or invalid requests to REST API endpoints (such as the Publisher API, Developer Portal API, or Admin API) and examine the HTTP error responses for the presence of Java stack traces, exception messages, or internal WSO2 package names (e.g., 'org.wso2.*').Affected if Error responses contain Java stack traces or internal WSO2 package names - this indicates the vulnerability is present and the environment is affected.
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Inspect HTTP response headers and bodyCapture and review full HTTP responses from the API Manager when triggering server-side errors (such as invalid API calls, malformed JSON, or unauthorized access attempts) using a tool like curl or Burp Suite.Affected if The response body includes detailed exception information, class names, or file paths from WSO2 internal packages.
The environment is affected if WSO2 API Manager version 3.0.0, 3.1.0, 3.2.0, or 4.0.0 is installed and REST API error responses expose Java stack traces or internal WSO2 package names to clients.
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 dataImplement proper error handling in REST API endpoints to catch exceptions and return generic, user-friendly error messages to clients instead of exposing stack traces with internal package names.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-6839 — 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-2023-6839 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
- No weaponised exploit code, or anything meant to cause harm
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