dbcve.org
Information ExposureWeakness · CWE-200

CVE-2026-53643

HIGH · 8.7 CVSS v4.0 Published 2026-07-06
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
93/100
Remediation priority · Urgent
Remotely reachable Zero-click 7 weeks old

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 free, open-source billing and client management system. Versions prior to 0.8.0 allow low-privileged staff accounts to perform unauthorized actions via admin API endpoints. The root cause is a combination of the `can_always_access` module flag (which grants all staff access to certain modules) and insufficient permission checks or unsafe parameter handling on individual endpoints. Version 0.8.0 contains a fix. Some workarounds are available. Restrict staff accounts to only those who need access to sensitive settings and/or use a reverse proxy or WAF to restrict access to the affected endpoints to trusted IP addresses or higher-privilege roles.

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 prior to 0.8.0 contain an authorization flaw where low-privileged staff accounts can execute unauthorized actions through admin API endpoints. The vulnerability stems from the `can_always_access` module flag combined with insufficient permission validation and unsafe parameter handling on specific API endpoints, allowing privilege escalation beyond the intended staff role boundaries.

MitigationPrimary mitigation is upgrading to version 0.8.0 which contains the fix. Additionally, restrict staff accounts to minimal required permissions and consider implementing WAF or reverse proxy rules to limit API endpoint access to trusted IPs or higher-privilege roles.

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
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/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 installed FOSSBilling version
    Check the version file or admin dashboard 'System > Information' page to determine the current FOSSBilling version
    Affected if Version is below 0.8.0 (e.g., 0.7.x, 0.6.x, etc.)
  2. Locate module configuration files
    Search the installation directory for configuration files containing 'can_always_access' flag or module settings
    Affected if The 'can_always_access' flag is present and set to true in any module configuration
  3. Review staff account role definitions
    Access admin panel 'Staff' section and examine role/permission definitions for staff accounts
    Affected if Staff accounts have permissions mapped to admin API endpoints beyond their intended role scope
  4. Inspect API endpoint access controls
    Examine API routing configuration files to identify endpoints that accept staff-level authentication
    Affected if Admin API endpoints accept staff session tokens without elevated permission validation
  5. Check parameter handling on sensitive API routes
    Review API controller code for endpoints handling user management, billing, or system configuration for unsafe parameter usage
    Affected if API endpoints accept user-controlled parameters without proper permission escalation checks

You are affected if FOSSBilling version is below 0.8.0 AND staff accounts exist with access to admin API endpoints via the can_always_access flag, allowing privilege escalation beyond intended role boundaries.

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

Primary mitigation is upgrading to version 0.8.0 which contains the fix. Additionally, restrict staff accounts to minimal required permissions and consider implementing WAF or reverse proxy rules to limit API endpoint access to trusted IPs or higher-privilege roles.

Recommended fix Moderate confidence

0.8.0

  1. Upgrade FOSSBilling to version 0.8.0 or later to obtain the security fix
  2. Review all staff accounts and restrict permissions to only those who require access to sensitive settings
  3. If upgrading is not immediately possible, implement a reverse proxy or WAF to restrict access to admin API endpoints to trusted IP addresses or higher-privilege roles

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

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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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-2026-53643 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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