{
  "affected": [
    {
      "affectedData": [
        {
          "product": "FOSSBilling",
          "vendor": "FOSSBilling",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 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 `\u003cscript\u003e` and `\u003clink\u003e` 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 \u0027 script \u0027 y \u0027 link \u0027 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"
    }
  ]
}