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Authorization Bypass (IDOR)Weakness · CWE-639

CVE-2025-64105

MEDIUM · 5.1 CVSS v4.0 Published 2026-06-23
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
55/100
Remediation priority · Elevated
Remotely reachable

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
FOSSBilling is a billing and client management system that automates invoicing, payments, and communication for online service businesses. Versions 0.6.21 through 0.7.2 are vulnerable to IDOR through the support ticket creation workflow. By manipulating rel_id when rel_type=order, an authenticated client can create a support ticket that references another client's order they do not own. The ticketCreateForClient() method accepted rel_id without verifying order ownership for non-upgrade tasks, allowing clients to link a new ticket to another client's order by crafting the request. No cron task automatically processes cancel/upgrade requests from ticket relations; staff action is required. This affects integrity and confidentiality: staff could be misled into acting on the wrong order (e.g., cancellation or upgrade requests). While there is no client-to-client order data exposure, order IDs may appear in ticket context. This issue has been fixed in version 0.8.0.

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 · high confidence

FOSSBilling versions 0.6.21 through 0.7.2 contain an IDOR vulnerability in the ticketCreateForClient() method. Authenticated clients can manipulate the rel_id parameter when rel_type=order to create support tickets referencing other clients' orders they do not own, due to missing ownership verification.

MitigationUpgrade to FOSSBilling version 0.8.0 which contains the fix. Alternatively, implement ownership validation in ticketCreateForClient() to verify the client owns the referenced order before ticket creation.

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
Low
Authentication
X
User interaction
P
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/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. Identify FOSSBilling installation version
    Locate the version file (typically includes/version.php or check admin panel System > Information page) and note the installed version number
    Affected if Installed version falls within 0.6.21 through 0.7.2 range
  2. Confirm client authentication is enabled
    Verify that client accounts are active and login functionality is operational in the system
    Affected if Client authentication is enabled and users can log into the client area
  3. Verify ticket module is accessible to clients
    Check if the support/ticket functionality is available to logged-in client users by reviewing module settings or attempting to access ticket creation interface
    Affected if Clients can access the ticket creation feature in their client area
  4. Check if order module is active
    Review module list in admin panel or check /var/modules/Order/ directory exists and is enabled in module configuration
    Affected if Order module is installed and active in the FOSSBilling installation

User is affected if FOSSBilling version is between 0.6.21 and 0.7.2, client login is enabled, and both ticket and order modules are active.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to FOSSBilling version 0.8.0 which contains the fix. Alternatively, implement ownership validation in ticketCreateForClient() to verify the client owns the referenced order before ticket creation.

Recommended fix High confidence

0.8.0

  1. Backup your current FOSSBilling installation and database before proceeding
  2. Download FOSSBilling version 0.8.0 from the official repository or release channel
  3. Extract the new version files to your FOSSBilling installation directory
  4. Review and update any custom configurations if needed
  5. Verify file permissions are correctly set after the upgrade
  6. Test the support ticket creation workflow to confirm the vulnerability is resolved
  7. Ensure all existing tickets and orders remain accessible and intact

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing3.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,750
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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-2025-64105 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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