Authorization bypass through user-controlled key in Easy!Appointments - CVE-2026-52837
Published: June 15, 2026
Vulnerability identifier: #VU134528
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-52837
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: A.Tselegidis
Affected software:
Easy!Appointments
Easy!Appointments
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to authorization bypass through user-controlled key in the booking reschedule view when handling a GET request to /index.php/booking/reschedule/{appointment_hash}. A remote attacker can send a request with a valid appointment hash to disclose sensitive information.
The response embeds the full customer record as inline JavaScript, exposing fields beyond those required by the reschedule interface.
How to mitigate CVE-2026-52837
Install security update from vendor's website.