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CVE-2026-52840— Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network

Quick assessment

Affected
alextselegidis easyappointments
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Alex Tselegidis Easy!Appointments是Alex Tselegidis个人开发者的一个在线预约系统。 Alex Tselegidis Easy!Appointments 1.6.0之前版本存在服务端请求伪造漏洞，该漏洞源于Caldav::connect_to_server函数在处理请求的caldav_url时未进行scheme或host验证，可能导致登录的后端用户访问部署网络上的回环、RFC1918和link-local主机，并引发服务端请求伪造（SSRF）漏洞。

CVSS 2.7 · Low EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1571 · Non-Standard Port

Affected Version Matrix 1

VendorProduct Version RangeStatus
alextselegidis easyappointments < 1.6.0 affected
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I. Basic Information for CVE-2026-52840

Vulnerability Information
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Vulnerability Title
Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Alex Tselegidis Easy!Appointments 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Alex Tselegidis Easy!Appointments是Alex Tselegidis个人开发者的一个在线预约系统。 Alex Tselegidis Easy!Appointments 1.6.0之前版本存在服务端请求伪造漏洞，该漏洞源于Caldav::connect_to_server函数在处理请求的caldav_url时未进行scheme或host验证，可能导致登录的后端用户访问部署网络上的回环、RFC1918和link-local主机，并引发服务端请求伪造（SSRF）漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
alextselegidis easyappointments < 1.6.0 -

II. Public POCs for CVE-2026-52840

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III. Intelligence Information for CVE-2026-52840

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Patches & Fixes for CVE-2026-52840 (1)

Vendor Advisories for CVE-2026-52840 (1)

Same Patch Batch · alextselegidis · 2026-07-14 · 6 CVEs total

CVE-2026-55651 7.1 HIGH Easy!Appointments Vulnerable to Appointments Takeover via Excessive Data Exposure
CVE-2026-52837 6.9 MEDIUM Easy!Appointments has unauthenticated customer PII disclosure on booking reschedule page
CVE-2026-52839 3.3 LOW Easy!Appointments appointments/store and appointments/update allow cross-provider appointm
CVE-2026-52841 3.1 LOW Easy!Appointments: Authorization bypass in Google OAuth provider binding lets any backend
CVE-2026-52838 2.6 LOW Easy!Appointments disable_booking_message rendered as raw HTML on public booking page — St

IV. Related Vulnerabilities

Same product: easyappointments
Same vendor: alextselegidis
Same weakness: CWE-918

V. Comments for CVE-2026-52840

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