CVE-2026-40495

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{"affected": [{"affectedData": [{"product": "FOSSBilling", "vendor": "FOSSBilling", "versions": [{"status": "affected", "version": "< 0.8.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 leak the exact system version through asset cache buster parameters in HTML output, bypassing the `hide_version_public` security setting. The FOSSBilling version is embedded in the query string of every `<script>` and `<link>` tag generated by the `script_tag` and `stylesheet_tag` Twig filters. This information is visible to all visitors \u2014 including unauthenticated guests \u2014 on every page, regardless of whether the `hide_version_public` setting is enabled. The `X-FOSSBilling-Version` HTTP header and the `guest.system.version` API endpoint correctly honour the `hide_version_public` setting, but the asset cache buster parameters were overlooked. Knowledge of the exact FOSSBilling version makes it significantly easier for malicious actors to identify known vulnerabilities applicable to a given installation and craft targeted exploits. While not a direct vulnerability on its own, it undermines the intended protection offered by the `hide_version_public` setting and facilitates reconnaissance. Version 0.8.0 contains a patch. There is no practical workaround that removes the version from asset URLs without modifying source code."}, {"lang": "es", "value": "FOSSBilling es un sistema de facturaci\u00f3n y gesti\u00f3n de clientes gratuito y de c\u00f3digo abierto. Las versiones anteriores a la 0.8.0 filtran la versi\u00f3n exacta del sistema a trav\u00e9s de par\u00e1metros de cache buster de activos en la salida HTML, eludiendo la configuraci\u00f3n de seguridad hide_version_public . La versi\u00f3n de FOSSBilling est\u00e1 incrustada en la cadena de consulta de cada etiqueta ' script ' y ' link ' generada por los filtros Twig script_tag y stylesheet_tag . Esta informaci\u00f3n es visible para todos los visitantes -incluidos los invitados no autenticados- en cada p\u00e1gina, independientemente de si la configuraci\u00f3n hide_version_public est\u00e1 habilitada. El encabezado HTTP X-FOSSBilling-Version y el endpoint API guest.system.version respetan correctamente la configuraci\u00f3n hide_version_public , pero los par\u00e1metros de cache buster de activos fueron pasados por alto. El conocimiento de la versi\u00f3n exacta de FOSSBilling facilita significativamente a los actores maliciosos identificar vulnerabilidades conocidas aplicables a una instalaci\u00f3n determinada y elaborar exploits dirigidos. Aunque no es una vulnerabilidad directa por s\u00ed misma, socava la protecci\u00f3n prevista ofrecida por la configuraci\u00f3n hide_version_public y facilita el reconocimiento. La versi\u00f3n 0.8.0 contiene un parche. No existe una soluci\u00f3n alternativa pr\u00e1ctica que elimine la versi\u00f3n de las URL de los activos sin modificar el c\u00f3digo fuente."}], "id": "CVE-2026-40495", "lastModified": "2026-07-22T20:10:00.127", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40495", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-04T13:49:19.491304Z", "version": "2.0.3"}}]}, "published": "2026-06-03T20:16:20.333", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-gqcp-g7rm-p5v6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.8.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "FOSSBilling", "source": "cna", "vendor": "FOSSBilling"}, "product": "fossbilling", "vendor": "fossbilling"}], "created": "2026-06-03T21:30:32.391349+00:00", "updated": "2026-06-03T21:30:32.704004+00:00", "vendors": ["fossbilling", "fossbilling$PRODUCT$fossbilling"]}