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CWE-35Weakness · CWE-35

CVE-2026-52703

CRITICAL · 9.6 CVSS v3.1 Published 2026-06-15
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
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
Unauthenticated Path Traversal in FastDup <= 2.7.2 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 confidence

Unauthenticated path traversal vulnerability in FastDup versions 2.7.2 and below allows remote attackers to access arbitrary files on the server file system via specially crafted directory traversal sequences in HTTP requests without any authentication.

MitigationUpgrade FastDup to a version newer than 2.7.2; if immediate patching is not feasible, implement strict input validation on all file path parameters and restrict filesystem access controls to limit exposure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify if FastDup is running
    Check running processes or services for fastdup (e.g., ps aux | grep -i fastdup, or check system service manager)
    Affected if FastDup process or service is running on the system
  2. Determine FastDup version
    Check the installed FastDup version using package manager, binary version flag, or check the application startup output (e.g., fastdup --version, dpkg -l fastdup, or rpm -qi fastdup)
    Affected if Installed version is 2.7.2 or below
  3. Verify web service is exposed
    Check if FastDup web interface is listening on a network port (e.g., netstat -tlnp | grep -E '(fastdup|http|8080|80)', or curl http://localhost:<port> to test connectivity)
    Affected if FastDup web service is bound to a network-accessible IP address rather than localhost only
  4. Test for path traversal vulnerability
    Attempt to access a known file outside the web root via the web interface (e.g., curl 'http://<host>/..%2F..%2Fetc/passwd' or similar path traversal pattern), checking if the server returns file contents instead of rejecting the request
    Affected if The web server returns contents of files outside the intended web root directory in response to traversal attempts

A system is affected if FastDup version 2.7.2 or below is running and its web service is network-accessible, allowing unauthenticated path traversal requests to access files outside the web root.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade FastDup to a version newer than 2.7.2; if immediate patching is not feasible, implement strict input validation on all file path parameters and restrict filesystem access controls to limit exposure.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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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-2026-52703 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