Auth bypass in Alextselegidis Easyappointments
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.002 (10.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N.
Affected products
- Alextselegidis Easyappointments — versions < 1.6.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-52841?
- CVE-2026-52841 is a low-severity vulnerability in Alextselegidis Easyappointments, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 3.1/10. Published 2026-07-14.
- How severe is CVE-2026-52841?
- Low severity. CVSS v3 base score is 3.1 out of 10.