Authorization bypass in alextselegidis easyappointments
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| alextselegidis | easyappointments | before 1.6.0 | 1.6.0 | Patch available | CNA |
| — | alextselegidis/easyappointments (Packagist) | up to 1.5.2 | — | No fix listed | GHSA-8hm4-r66f-29wr |
- easyappointments Vendoralextselegidis Affected before 1.6.0 Fixed in 1.6.0 Patch available CNA
- alextselegidis/easyappointments (Packagist) Vendor— Affected up to 1.5.2 Fixed in — No fix listed GHSA-8hm4-r66f-29wr
Remediation
- Fix · CNA easyappointments (alextselegidis) Fixed in 1.6.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-52841
- 2026-10-03 Alias added: GHSA-8hm4-r66f-29wr
References
Other 4
- https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-8hm4-r66f-29wr
- https://github.com/alextselegidis/easyappointments/commit/4b2d245d2cd2058dc76e05f6eb65b26699268471
- https://github.com/alextselegidis/easyappointments
- https://github.com/alextselegidis/easyappointments/releases/tag/1.6.0
More alextselegidis vulnerabilities
- TI-2023-01200 Use of Hard-coded Credentials in alextselegidis/easyappointments CVSS 3.1CRITICAL 9.8
- TI-2026-70736 Easy!Appointments authorization bypass lets attackers modify bookings CVSS 4.0HIGH 8.8
- TI-2024-37956 An issue in Alex Tselegidis EasyAppointments v.1.5.0 allows a remote attacker to escalate… CVSS 3.1CRITICAL 9.8
- TI-2026-19023 CSRF Protection Bypass: Sensitive endpoints accept GET requests, enabling admin account takeover CVSS 4.0HIGH 7.4
- TI-2025-32119 alextselegidis Easy!Appointments v1.5.1 was discovered to contain a SQL injection… CVSS 3.1HIGH 8.1
- TI-2023-01980 Session Fixation in alextselegidis/easyappointments CVSS 3.1HIGH 8.8
Sources
- CVE-2026-52841 · CVE Program
- CVE-2026-52841 · NVD
- FIRST EPSS
- GHSA-8hm4-r66f-29wr · GitHub Advisory Database · CC BY 4.0
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