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    CVE-2026-52841

    Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Google::oauth` at `application/controllers/Google.php:278` stores its URL-supplied `provider_id` in the session, and `oauth_callback` saves the issued Google OAuth token against that row without checking the caller owns the provider. Any logged-in backend user (admin, provider, or secretary) rebinds a peer provider's Google sync to a Google account they control. The peer's appointments then sync into the attacker's calendar with each customer's name and email attached as attendee data. Version 1.6.0 patches the issue.

    Published:Jul 14, 2026
    Last Modified:Jul 14, 2026
    EPS:Jul 14, 2026
    EPSS Score:
    CVSS Score:3.1

    Affected Products

    Vendor
    Alextselegidis
    Product
    Easyappointments

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-55651 (CVSS 7.1) — Easy!Appointments is a self hosted appointment scheduler. In version 1.5.2, an Excessive Data Exposure vulnera…
    CVE-2026-52840 (CVSS 2.7) — Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Caldav::connect_to_serv…
    CVE-2026-52839 (CVSS 3.3) — Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 correctly filter provider-sc…
    CVE-2026-52838 (CVSS 2.6) — Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to defi…
    CVE-2026-52837 (CVSS 6.9) — Easy!Appointments is a self hosted appointment scheduler. In versions up to and including 1.5.2, the booking r…
    CVE-2026-23622 (CVSS 7.4) — Easy!Appointments is a self hosted appointment scheduler. In 1.5.2 and earlier, application/core/EA_Security.p…
    CVE-2025-50383 (CVSS 8.1) — alextselegidis Easy!Appointments v1.5.1 was discovered to contain a SQL injection vulnerability via the order_…
    CVE-2023-3568 (CVSS 6.3) — Open Redirect in GitHub repository alextselegidis/easyappointments prior to 1.5.0. …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High