Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-52841Easy!Appointments: Authorization bypass in Google OAuth provider binding lets any backend user rebind a peer provider's Google sync
Low 3.1
In plain English
A low-severity authorization bypass via user-controlled key in easyappointments from alextselegidis. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | alextselegidis/easyappointments | no fix listed | GHSA-8hm4-r66f-29wr |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| alextselegidis | easyappointments | < 1.6.0 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N