VulnerabilityDeferred

CVE-2026-52838

Versions prior to 1.6.0 allow administrators to define a custom "booking disabled" message through the booking settings page.

LOW 2.6EPSS 0.24%

Does this matter?

Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 2.6 LOWCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:L/A:N
EPSS: 0.24% probability · 16th percentile
CISA KEV: Not listed
Weakness: CWE-79
Source: security-advisories@github.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.