CVE-2026-52840
Published:July 14, 2026
Updated:August 04, 2026
Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, "Caldav::connect_to_server" at "application/controllers/Caldav.php:60" hands the request's "caldav_url" to a Guzzle "REPORT" call without scheme or host validation. A logged-in backend user (admin, provider, or secretary) reaches loopback, RFC1918, and link-local hosts on the deployment's network. The Guzzle exception path returns the upstream status code plus ~120 bytes of response body in the JSON "message" field ("Caldav.php:74-78"), so the SSRF is semi-blind. Version 1.6.0 contains a patch.
Affected Packages
https://github.com/alextselegidis/easyappointments.git (GITHUB):
Affected version(s) >=1.5.0 <1.6.0Fix Suggestion:
Update to version 1.6.0Related Resources (9)
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Contact UsCVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
2.7
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Server-Side Request Forgery (SSRF)
EPSS
Base Score:
0.19