CVE-2026-53642Network attack vector

Account-data disclosure via overbroad client path check

Published Jul 6, 2026 · Updated Jul 6, 2026

Incorrect authorization in FOSSBilling 0.5.6 through 0.7.2 allows remote authenticated users to read restricted client account data. The page-request check in src/di.php treats every path beginning with /client as allowed, so it never raises EmailValidationRequiredException for protected client pages. Exploitation requires the Require Email Confirmation setting and a logged-in account with email_approved set to 0; exposed data includes balances, transactions, invoices, orders, tickets, and service details.

CVSS severity5.3
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in FOSSBilling 0.5.6 through 0.7.2 allows remote authenticated users to read restricted client account data. The page-request check in src/di.php treats every path beginning with /client as allowed, so it never raises EmailValidationRequiredException for protected client pages. Exploitation requires the Require Email Confirmation setting and a logged-in account with email_approved set to 0; exposed data includes balances, transactions, invoices, orders, tickets, and service details.

The record

CVE
CVE-2026-53642
Published
Jul 6, 2026
Updated
Jul 6, 2026
Vendor
FOSSBilling
Product
FOSSBilling
Classifications
CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.5.6, < 0.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FOSSBilling · FOSSBillingversion=>= 0.5.6, < 0.8.0

Published CVSS scores

5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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