CVE-2026-65825: Brute Force (CVSS 7.5)

Description

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.

Is your site exposed to CVE-2026-65825?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Weakness Type (CWE)

CWE-307 CWE-307

References

Other References

https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-v4q4-xmqf-gmq8

Frequently Asked Questions

What is CVE-2026-65825? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-65825? +

CVE-2026-65825 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-65825? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-2911

Unauthorised access to the call forwarding service system in MeetMe products in versions prior to 2024-09 allows an attacker to …

CVE-2025-24806

Authelia is an open-source authentication and authorization server providing two-factor authentication and single sign-on (SSO) for applications via a web …

CVE-2025-1714

Lack of Rate Limiting in Sign-up workflow in Perforce Gliffy prior to version 4.14.0-7 on Gliffy online allows attacker to …

CVE-2025-0417

Lack of protection against brute force attacks in Valmet DNA visualization in DNA Operate. The possibility to make an arbitrary …

CVE-2025-42600

This vulnerability exists in Meon KYC solutions due to missing restrictions on the number of incorrect One-Time Password (OTP) attempts …

CVE-2025-6029

Use of fixed learning codes, one code to lock the car and the other code to unlock it, the Key …

CVE-2026-65825