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TI-2026-79992 Aliases CVE-2026-65825

Cross-tenant bypass of PIN brute-force throttle in OpenReception

Priority LOW 32CWE-307Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-307.

Summary

In OpenReception appointment booking software 2.1.0 and prior, one tenant's throttle row disables the PIN brute-force throttle for the same identifier in another tenant (CWE-307). A remote unauthenticated attacker can brute-force a returning client's six-digit booking PIN online in the victim tenant. A correct guess yields the client's booking access token, exposing their end-to-end-encrypted appointment data and letting the attacker act as the client.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. In versions 2.1.0 and prior, a returning client's six-digit booking PIN can be brute-forced online in the victim tenant. A successful guess yields the client's booking access token, granting access to that client's appointment tunnel, which holds their end-to-end-encrypted appointment data, and the ability to act as the client, for example adding or cancelling appointments in the tunnel. The bypass is cross-tenant: state owned by one tenant removes an authentication protection of a different tenant. This crossing of the tenant boundary is the basis for the scope-changed vector. At time of publication, there are no publicly available patches.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00216 12th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
open-receptionappointment-booking-softwareup to 2.1.0—No fix listedCNA
  • appointment-booking-software Vendoropen-reception Affected up to 2.1.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for OpenReception appointment booking software.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-65825
  2. 2026-10-24 Priority changed: MEDIUM → LOW
  3. 2026-10-26 CISA SSVC decision points changed

References

Other 1

  • TI-2026-35529 OpenReception vulnerable to unauthenticated staff crypto poisoning that breaks E2E recipient directory CVSS 3.1CRITICAL 9.4
  • TI-2026-35528 OpenReception: WebAuthn passkey injection allows account takeover CVSS 3.1CRITICAL 9.8
  • TI-2026-35526 OpenReception has unauthenticated GLOBAL_ADMIN account creation post-bootstrap CVSS 3.1CRITICAL 9.8
  • TI-2026-35527 OpenReception: Tenant admin self-promotes to GLOBAL_ADMIN CVSS 3.1CRITICAL 9.9
  • TI-2026-79990 Host header poisoning in OpenReception enables account takeover CVSS 3.1HIGH 8.3
  • TI-2026-35522 OpenReception vulnerable to stored click-triggered XSS via javascript: tenant links rendered into patient-facing footer CVSS 3.1HIGH 8.1
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences