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CVE-2026-53642 FOSSBilling CVE debrief

A vulnerability was found in FOSSBilling versions 0.5.6 through 0.7.2. When the 'Require Email Confirmation' setting is enabled, a logged-in client with an unverified email address can access all client-area pages and read real account data, including wallet balances and transaction history. The issue is due to overly permissive page-side enforcement, allowing any request whose path starts with '/client'. This vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. Users of FOSSBilling versions 0.5.6 through 0.7.2 should be aware of this vulnerability and take necessary precautions to protect their systems.

Vendor
FOSSBilling
Product
Unknown
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-06
Original CVE updated
2026-07-07
Advisory published
2026-07-06
Advisory updated
2026-07-07

Who should care

Users of FOSSBilling versions 0.5.6 through 0.7.2, especially those who have not upgraded to version 0.8.0, should be aware of this vulnerability and take necessary precautions to protect their systems. This includes reviewing and adjusting the 'Require Email Confirmation' setting, monitoring client-area page access and account data for suspicious activity, and implementing additional security measures to protect against unauthorized access.

Technical summary

The vulnerability exists in FOSSBilling versions 0.5.6 through 0.7.2. The API-side enforcement correctly restricts unverified clients to only profile-related endpoints, but the page-side enforcement is overly permissive. This allows a logged-in client with an unverified email address to access all client-area pages and read real account data. The issue can be resolved by upgrading to version 0.8.0. The CVE record was published on 2026-07-06T23:16:56.097Z and has not been modified since then.

Defensive priority

Medium priority should be given to upgrading FOSSBilling to version 0.8.0 or applying necessary patches to prevent exploitation of this vulnerability.

Recommended defensive actions

  • Upgrade FOSSBilling to version 0.8.0 or later
  • Review and adjust the 'Require Email Confirmation' setting
  • Monitor client-area page access and account data for suspicious activity
  • Implement additional security measures to protect against unauthorized access
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-06T23:16:56.097Z and was last modified on 2026-07-07T15:16:47.823Z. The NVD entry is currently Deferred. The source item URL for CVE-2026-53642 is available but details are limited. Defenders should verify the affected scope and severity with the vendor and review compensating controls for exposed systems.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53642 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53642

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53642 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53642

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.