OpenReception Appointment Booking Software up to 1.x Account Confirmation invite/+server.ts Host access control

Summaryinfo

A vulnerability marked as critical has been reported in OpenReception Appointment Booking Software up to 1.x. Affected by this issue is some unknown functionality of the file invite/+server.ts of the component Account Confirmation. This manipulation of the argument Host causes access control. This vulnerability is handled as CVE-2026-58202. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenReception Appointment Booking Software up to 1.x. It has been declared as critical. Affected by this vulnerability is an unknown code of the file invite/+server.ts of the component Account Confirmation. The manipulation of the argument Host with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.0.0, the account-confirmation link in emails is built from the request Host header, with no allowlist. The unauthenticated POST /api/auth/resend-confirmation rotates a pending invitee's confirmation token and emails a link whose host comes from the request. An attacker who sends one resend-confirmation with Host: attacker.example and a pending invitee's email causes that invitee to receive a confirmation email whose only link points to the attacker. If the invitee clicks, the one-time confirmation token reaches the attacker, who then confirms the account on the real tenant domain and registers a passkey they control, taking over the account before the legitimate invitee ever uses it. All released versions through v1.1.0 are affected; no patched version exists yet. Reaching the app with a spoofed Host depends on the front proxy: the stock Caddy catch-all forwards it, while an operator who configures explicit per-tenant proxy blocks is not affected (see Details 4). The invite path builds links from the trusted tenant.domain (invite/+server.ts:204-210); the resend-confirmation path builds them from the request Host. This issue has been patched in version 2.0.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-58202 since 06/29/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 2.0.0 eliminates this vulnerability.

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Productinfo

Type

• Appointment Software

Vendor

• OpenReception

Name

• Appointment Booking Software

Version

• 1.x

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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