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CVE-2026-52839— Easy!Appointments appointments/store and appointments/update allow cross-provider appointment injection — Authorization Bypass

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之前版本存在授权问题漏洞，该漏洞源于对 和 端点中 参数的权限验证不当，可能导致已认证的提供者向其他提供者的日程中注入新的预约或重新分配预约。

CVSS 3.3 · Low EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1078.003 · Local Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
alextselegidis easyappointments < 1.6.0 affected
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I. Basic Information for CVE-2026-52839

Vulnerability Information
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Vulnerability Title
Easy!Appointments appointments/store and appointments/update allow cross-provider appointment injection — Authorization Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 correctly filter provider-scoped appointments in the `appointments/search` response, proving that provider isolation is an intended security boundary. However, the direct mutation endpoints `appointments/store` and `appointments/update` only check generic appointment privileges and never verify that the submitted `id_users_provider` belongs to the current session. A normal authenticated provider can inject new appointments into another provider's schedule via `store`, or reassign existing appointments into a foreign provider's calendar via `update`. The `store` path contains an additional write-before-crash bug: the unauthorized row is committed to the database before the controller crashes on a type error, so the attacker receives an error response while the foreign appointment is already persisted. Version 1.6.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Alex Tselegidis Easy!Appointments 授权问题漏洞
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之前版本存在授权问题漏洞，该漏洞源于对 `appointments/store` 和 `appointments/update` 端点中 `id_users_provider` 参数的权限验证不当，可能导致已认证的提供者向其他提供者的日程中注入新的预约或重新分配预约。
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-2026-52839

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III. Intelligence Information for CVE-2026-52839

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Patches & Fixes for CVE-2026-52839 (2)

Vendor Advisories for CVE-2026-52839 (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-2026-52841 3.1 LOW Easy!Appointments: Authorization bypass in Google OAuth provider binding lets any backend
CVE-2026-52840 2.7 LOW Easy!Appointments has server-side request forgery in CalDAV connection test that exposes t
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-639

V. Comments for CVE-2026-52839

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