CVE-2026-48086 (GCVE-0-2026-48086)
Vulnerability from cvelistv5 – Published: 2026-08-06 21:30 – Updated: 2026-08-07 14:36
VLAI
EPSS
VEX
Title
OpenReception: Tenant admin self-promotes to GLOBAL_ADMIN
Summary
OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.2, a TENANT_ADMIN promotes themselves to platform-wide GLOBAL_ADMIN through a single PUT request. The role-update handler accepts the `GLOBAL_ADMIN` enum value from any tenant admin updating their own tenant's staff. No policy check enforces that "only an existing GLOBAL_ADMIN may grant GLOBAL_ADMIN", so the schema validation IS the authorization decision. After re-login, the JWT contains the new role and the formerly-tenant-scoped admin reaches every other tenant on the platform. On the hosted OpenReception service this is a scope-changed escalation: a single customer-side tenant administrator gains full platform-wide administrative control over all other tenants' configuration, users, staff records, operational metadata, and tenant lifecycle. Plaintext appointment contents remain subject to the E2E model unless chained with the staff-crypto poisoning issue (V-4) or with staff-passkey hijacking (V-1). On a single-tenant self-hosted deployment it is still a privilege escalation because TENANT_ADMIN should not be able to create new tenants, modify global configuration, or manage other administrators. The same handler also accepts updates targeted at any colleague within the tenant. A tenant admin can promote a separate collaborator account instead of themselves, leaving their own audit trail clean while the platform-wide breach happens through a separate identity. Version 1.0.2 fixes the issue.
Severity
9.9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-07 14:36 UTC
CWE
- CWE-269 - Improper Privilege Management
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/open-reception/appointment-boo… | x_refsource_CONFIRM |
| https://github.com/open-reception/appointment-boo… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| open-reception | appointment-booking-software |
Affected:
< 1.0.2
|
guessed |
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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