OpenReception appointment-booking-software up to 1.0.1 SvelteKit Button /api/public cross site scripting

Summaryinfo

A vulnerability has been found in OpenReception appointment-booking-software up to 1.0.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /api/public of the component SvelteKit Button Component. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-48081. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in OpenReception appointment-booking-software up to 1.0.1. It has been rated as problematic. This issue affects an unknown part of the file /api/public of the component SvelteKit Button Component. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.2, a TENANT_ADMIN can store `javascript:` URLs in the tenant `links` configuration (`website`, `imprint`, `privacyStatement`). These values are returned to the patient-facing landing page via `/api/public`, hydrated into the SvelteKit Button component, and rendered as `<a href="javascript:...">` elements without URL-scheme filtering. A patient who clicks any such link executes the attacker's JavaScript inside the patient browser origin, where patient form data is read before client-side encryption is applied. This breaks the project's central trust claim that the server is an untrusted relay and that administrators cannot read patient data. Patient-side encryption happens after form input, so JavaScript executing in the patient origin can read or alter the plaintext before encryption is performed. Version 1.0.2 fixes the issue.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-48081 since 05/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.0.2 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Appointment Software

Vendor

• OpenReception

Name

• appointment-booking-software

Version

• 1.0.0
• 1.0.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion