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Authorization Bypass (IDOR)Weakness · CWE-639

CVE-2025-42605

CRITICAL · 9.3 CVSS v4.0 Published 2025-04-23
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 Zero-click

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
This vulnerability exists in Meon Bidding Solutions due to improper authorization controls on certain API endpoints for the initiation, modification, or cancellation operations. An authenticated remote attacker could exploit this vulnerability by manipulating parameter in the API request body to gain unauthorized access to other user accounts. Successful exploitation of this vulnerability could allow remote attacker to perform authorized manipulation of data associated with other user accounts.

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

Meon Bidding Solutions contains broken access control (IDOR) vulnerabilities in certain API endpoints. Authenticated attackers can manipulate parameters in API request bodies to access or modify data belonging to other users, bypassing insufficient authorization checks on initiation, modification, and cancellation operations.

MitigationImplement proper authorization validation on all API endpoints to verify the authenticated user has rights to access or modify the requested resource. Use indirect references and validate object ownership before processing operations.

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
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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. Confirm Meon Bidding Solutions installation
    Locate the Meon Bidding Solutions installation directory or service. Check for running processes or installed packages named 'meon', 'bidding', or similar. Look for the application in /opt, /usr/local, or standard application directories.
    Affected if The product is present in the environment and exposes API functionality.
  2. Identify exposed API endpoints
    Review application configuration files (e.g., web.config, application.yml, settings files) for API route definitions. Use network scanning or check documentation to list available endpoints, particularly those handling initiation, modification, and cancellation operations.
    Affected if API endpoints are accessible and handle business operations like bidding initiation, modification, or cancellation.
  3. Verify authentication mechanism is in use
    Inspect authentication configuration (e.g., OAuth settings, session management, API key configuration). Confirm that the API requires valid user credentials before allowing access to protected resources.
    Affected if The API accepts authenticated sessions and authenticates users.
  4. Test for IDOR via parameter manipulation
    Log in as a non-privileged user. Capture API requests for initiation, modification, or cancellation operations. Modify user/object identifiers in the request body (such as user_id, bid_id, or reference parameters) to point to another user's data. Observe if the API returns or modifies data belonging to a different user without authorization errors.
    Affected if The API returns or allows modification of data belonging to another user when parameters are altered, indicating missing authorization checks.
  5. Review API authorization configuration
    Examine application logs and configuration for authorization enforcement points. Check if object-level ownership validation exists before processing create, update, or delete operations. Look for code or config that validates the authenticated user owns the requested resource.
    Affected if No explicit ownership validation is found for API operations, or authorization checks are absent on the vulnerable endpoints.

A user is affected if Meon Bidding Solutions is deployed with accessible API endpoints that process requests without properly validating that the authenticated user owns or has rights to the specific resource being accessed or modified.

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

Implement proper authorization validation on all API endpoints to verify the authenticated user has rights to access or modify the requested resource. Use indirect references and validate object ownership before processing operations.

Have this fixed Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA8.0 h
44.0 hours of engineering $7,720
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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-2025-42605 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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