CVE Watch19 oct 2026

CVE-2026-111056

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/cre

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

0-100

Publicado: 19 oct 2026 · Última mod.: 19 oct 2026 · CWE-200 · CWE-204 · CWE-307

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted email already exists. The trigger is an unauthenticated request to POST /api/guest/client/create with a target email address. An attacker can compare the guest-signup response for a target email to determine whether the email belongs to an existing FOSSBilling client. Box\Mod\Client\Api\Guest::create returns the error after Client\Service::clientAlreadyExists finds a matching record, and the API response exposes that exception message without redaction. This issue is fixed in version 0.8.7.

Referencias oficiales

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