alextselegidis Easy!Appointments up to 1.6.0 Booking Booking::register authorization

Summaryinfo

A vulnerability has been found in alextselegidis Easy!Appointments up to 1.6.0 and classified as critical. Affected is the function Booking::register of the component Booking. The manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-108758. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in alextselegidis Easy!Appointments up to 1.6.0. This issue affects the function Booking::register of the component Booking. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Easy!Appointments through 1.6.0 contains an authorization bypass vulnerability in Booking::register() that allows unauthenticated attackers to modify any appointment by supplying an appointment id without its hash. Attackers can enumerate sequential appointment ids with a self-asserted manage_mode flag to rewrite appointment details, rebind them to attacker-controlled customers, and obtain management hashes for rescheduling or cancellation.

The advisory is shared at hackmd.io. The identification of this vulnerability is CVE-2026-108758 since 10/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/11/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Appointment Software

Vendor

• alextselegidis

Name

• Easy!Appointments

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6.0

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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