CVE-2026-27604
fossbilling: Exposure of Sensitive Information
- Act
- CVSS 10.0 Critical
- VulnCheck KEV
What it is
ReportedFOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged `/api/system/*` endpoints. Because `system` resolves to the cron admin identity, attackers can invoke admin API methods without valid credentials, session, or CSRF token. Version 0.8.0 patches the issue. Some workarounds are available.…
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What is affected
Reportedfossbilling; fossbilling. Product-level identification only; no affected-version conclusion is available from this field.
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Urgency and basis
Tracker computedAct
Current priority score and EPSS: loading from the tracker record. They are read when this page loads and are not shown without JavaScript. They change daily and are not part of "Source last updated".
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Exploitation evidence
Reportedlisted by a tracked exploitation catalog · VulnCheck KEV
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What to do
ReportedApply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
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Detection and validation
Mapped metadata availability only. These signals do not change priority.
Sigma, Atomic, Nuclei, and Metasploit: none mapped by tracked sources.
Sigma
Not mapped by tracked sources.
Atomic
Not mapped by tracked sources.
Nuclei
Not mapped by tracked sources.
Evidence detail
Loading the full tracker evidence record…