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CVE-2026-52838— Easy!Appointments disable_booking_message rendered as raw HTML on public booking page — Stored XSS

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之前版本存在跨站脚本漏洞，该漏洞源于booking settings页面中“booking disabled”消息存储后未进行转义或清理，可能导致经过身份验证的管理员存储HTML或JavaScript，并在启用禁用预订模式时触发存储型跨站脚本攻击。

CVSS 2.6 · Low EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
alextselegidis easyappointments < 1.6.0 affected
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I. Basic Information for CVE-2026-52838

Vulnerability Information
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Vulnerability Title
Easy!Appointments disable_booking_message rendered as raw HTML on public booking page — Stored XSS
Source: CVE Program / CVE List V5
Vulnerability Description
Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to define a custom "booking disabled" message through the booking settings page. That value is stored in the `disable_booking_message` setting via a rich-text editor and later passed directly to the public `booking_message` view without escaping or sanitization. An authenticated administrator can store HTML or JavaScript in this field, enable disabled-booking mode, and trigger stored XSS in every unauthenticated visitor who opens the public booking page. Version 1.6.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Alex Tselegidis Easy!Appointments 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于booking settings页面中“booking disabled”消息存储后未进行转义或清理，可能导致经过身份验证的管理员存储HTML或JavaScript，并在启用禁用预订模式时触发存储型跨站脚本攻击。
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-2026-52838

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III. Intelligence Information for CVE-2026-52838

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Patches & Fixes for CVE-2026-52838 (1)

Vendor Advisories for CVE-2026-52838 (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-2026-52840 2.7 LOW Easy!Appointments has server-side request forgery in CalDAV connection test that exposes t

IV. Related Vulnerabilities

Same product: easyappointments
Same vendor: alextselegidis
Same weakness: CWE-79

V. Comments for CVE-2026-52838

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