CVE-2026-55739
AuthZ bypass in Crater lets one tenant access and delete another tenant's customer data.
Is CVE-2026-55739 being exploited?
Not confirmed. CVE-2026-55739 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-55739?
CVE-2026-55739 is rated High with a CVSS score of 8.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55739?
Not known from our data. No patch reference has been recorded for CVE-2026-55739, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-55739 affect?
CVE-2026-55739 affects Crater (self-hosted invoicing app), CustomerPolicy view/update/delete methods, Route-model-bound customer endpoints, Customer::deleteCustomers() bulk delete. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55739?
Patch ASAP; add company_id scoping to all customer lookups, restrict access, audit logs, restore backups if needed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated user from one company can read, reassign, or delete another company's customers; deletions cascade to invoices and payments causing data theft and data loss.
Immediate action required
- affected6.0.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.