Authorization bypass in alextselegidis easyappointments
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- 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. Versions prior to 1.6.0 correctly filter provider-scoped appointments in the `appointments/search` response, proving that provider isolation is an intended security boundary. However, the direct mutation endpoints `appointments/store` and `appointments/update` only check generic appointment privileges and never verify that the submitted `id_users_provider` belongs to the current session. A normal authenticated provider can inject new appointments into another provider's schedule via `store`, or reassign existing appointments into a foreign provider's calendar via `update`. The `store` path contains an additional write-before-crash bug: the unauthorized row is committed to the database before the controller crashes on a type error, so the attacker receives an error response while the foreign appointment is already persisted. Version 1.6.0 patches the issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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) | before 1.6.0 | 1.6.0 | Patch available | GHSA-w8xc-8g92-v77h |
- easyappointments Vendoralextselegidis Affected before 1.6.0 Fixed in 1.6.0 Patch available CNA
- alextselegidis/easyappointments (Packagist) Vendor— Affected before 1.6.0 Fixed in 1.6.0 Patch available GHSA-w8xc-8g92-v77h
Remediation
- Fix · CNA easyappointments (alextselegidis) Fixed in 1.6.0
- Fix · GHSA-w8xc-8g92-v77h alextselegidis/easyappointments (Packagist) Fixed in 1.6.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-52839
- 2026-10-03 Alias added: GHSA-w8xc-8g92-v77h
References
Other 4
- https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h
- https://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef
- 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-2026-52839 · CVE Program
- CVE-2026-52839 · NVD
- FIRST EPSS
- GHSA-w8xc-8g92-v77h · GitHub Advisory Database · CC BY 4.0
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