Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / packagist/alextselegidis/easyappointments/CVE-2026-52838
Advisory ID gitlab/packagist/alextselegidis/easyappointments/CVE-2026-52838
Aliases CVE-2026-52838
GHSA-996f-334j-67g7
Summary Easy!Appointments disable_booking_message rendered as raw HTML on public booking page — Stored XSS Easy!Appointments allows 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: ```php <p><?= vars('message_text') ?></p> ``` 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. ---
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/alextselegidis/easyappointments/CVE-2026-52838.yml
Reference id Reference type URL
https://github.com/alextselegidis/easyappointments/commit/629a0415f54f75556c17f4f5d9c77fda1fdbdeae
https://github.com/alextselegidis/easyappointments/releases/tag/1.6.0
https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-996f-334j-67g7
https://nvd.nist.gov/vuln/detail/CVE-2026-52838
GHSA-996f-334j-67g7 https://github.com/advisories/GHSA-996f-334j-67g7
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:L/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/alextselegidis/easyappointments/CVE-2026-52838.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-07-14T15:59:57Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/52xxx/CVE-2026-52838.json

Source Advisory: vulnrichment/CVE-2026-52838

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]