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FOSSBilling CVE-2026-42341

| EUVDEUVD-2026-41944 CRITICAL
Missing Authentication for Critical Function (CWE-306)
2026-07-06 GitHub_M
Authentication Bypass PHP Fossbilling
9.2
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
9.2 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/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
vuln.today AI
7.5 HIGH

Remote, low-complexity, unauthenticated single request (AV:N/AC:L/PR:N/UI:N) forging financial state gives I:H with no confidentiality or availability impact; enabling the adapter is config, not a privilege.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 06, 2026 - 22:02 EUVD
Analysis Generated
Jul 06, 2026 - 21:49 vuln.today

DescriptionCVE.org

FOSSBilling is a free, open-source billing and client management system. Versions 0.6.0 through 0.7.2 have an unauthenticated payment bypass vulnerability in FOSSBilling's IPN callback endpoint. When the Custom payment adapter is enabled, an attacker can mark any unpaid invoice as paid and credit the associated client account without making an actual payment, by sending a single crafted HTTP request. Version 0.8.0 patches the issue. Some workarounds are available. Disable the Custom payment gateway if not actively needed and/or restrict access to /ipn.php at the web server level (e.g., via IP allowlisting), noting that this may interfere with legitimate payment callback processing.

Articles & Coverage 2

News 5 New PHP Vulnerabilities - 2 Critical, 3 High, 2 With POC Jul 07, 2026 News Critical Payment Bypass in FOSSBilling 0.6.0-0.7.2 - CVE-2026-42341 Jul 06, 2026

AnalysisAI

Unauthenticated payment bypass in FOSSBilling 0.6.0 through 0.7.2 lets a remote attacker mark any unpaid invoice as paid and credit the associated client's account balance with a single crafted HTTP request to the IPN callback endpoint (/ipn.php), provided the Custom payment adapter is enabled. The flaw stems from missing authentication (CWE-306) on a financially critical callback, so no credentials or user interaction are needed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed /ipn.php endpoint
Delivery
Craft forged Custom-adapter IPN callback
Exploit
Send single unauthenticated HTTP request
Execution
Invoice marked paid and account credited
Impact
Obtain paid services or store credit
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Vulnerability AssessmentAI

Exploitation The exploit requires that the FOSSBilling 'Custom' payment adapter/gateway be enabled and that the IPN endpoint /ipn.php be network-reachable by the attacker - that specific configuration IS the precondition. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are largely consistent and point to a genuine, high-severity integrity issue rather than an inflated score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario On a FOSSBilling instance with the Custom payment adapter enabled, an attacker registers or targets an account with outstanding invoices, then sends one crafted unauthenticated HTTP POST to /ipn.php referencing the target invoice. FOSSBilling accepts the forged callback, marks the invoice paid, and credits the client account, granting paid services or store credit without any real payment. …
Remediation Vendor-released patch: upgrade to FOSSBilling 0.8.0, which fixes the IPN authentication gap; this is the primary and recommended action per advisory GHSA-5493-9m76-2qrr (https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-5493-9m76-2qrr). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: if running FOSSBilling 0.6.0-0.7.2, disable the Custom payment adapter or restrict access to the /ipn.php endpoint to known trusted payment gateway IPs. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-42341 vulnerability details – vuln.today
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