CVE-2026-53906
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 · uneditedMCO is vulnerable to Path Disclosure and Path Traversal in file handling functionality related to data export and upload. Improper validation of the filename parameter allows writing files to arbitrary locations as well as indirect disclosure of absolute server paths through error messages. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
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 confidenceMCO contains a path traversal vulnerability in its file handling functionality for data export and upload operations. The filename parameter lacks proper validation, allowing attackers to manipulate path references to write files to arbitrary locations on the server. Additionally, error messages generated during failed operations expose absolute server paths, enabling further reconnaissance.
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= 25.3.3.1CVSS 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
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/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 installed Mycomplianceoffice versionAccess the application admin panel or check the software inventory to determine the exact version number of Mycomplianceoffice currently deployedAffected if The installed version is exactly 25.3.3.1 (this specific version is affected)
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Locate file export and upload functionalityIdentify the data export and file upload endpoints or modules within the Mycomplianceoffice application interfaceAffected if The application exposes any file export or upload features that accept a filename parameter
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Inspect application logs for path disclosureReview application error logs, web server logs, and debug outputs for error messages containing absolute file paths (such as /var/, /home/, C:\)Affected if Error messages or exception outputs reveal absolute server file paths in logs
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Check web root for unexpected filesExamine the web document root directory for files that should not exist, particularly in parent directories or system folders outside the expected upload directoryAffected if Files appear outside the intended upload directory, suggesting successful path traversal
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Review filename parameter handlingIf you have access to the application source or configuration, examine how the filename parameter is processed in export and upload operations for lack of path validationAffected if The filename parameter accepts raw user input without validation or path normalization
A user is affected if running Mycomplianceoffice version 25.3.3.1 and the file export/upload functionality with the vulnerable filename parameter is accessible and exposed
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 strict input validation and path sanitization for filename parameters, using allowlists and canonicalization to prevent traversal sequences. Additionally, sanitize error messages to prevent path disclosure, removing absolute path information from user-facing messages.
- Consultation6.0 h
- Implementation12.0 h
- Testing10.0 h
- Review / QA6.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-53906 — 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-2026-53906 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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