Easy!Appointments Vulnerable to Appointments Takeover via Excessive Data Exposure
Priority MEDIUM 64CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
Easy!Appointments is a self hosted appointment scheduler. In version 1.5.2, an Excessive Data Exposure vulnerability in the customers search endpoint allows an authenticated user to obtain appointment hashes belonging to other users. Using these hashes, an attacker can modify or delete appointments of other providers, resulting in an Appointments Takeover. Version 1.6.0 fixes the issue.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00228 13th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | = 1.5.2 | — | No fix listed | CNA |
| — | alextselegidis/easyappointments (Packagist) | — | — | No fix listed | GHSA-4vmm-5qvc-w5p7 |
- easyappointments Vendoralextselegidis Affected = 1.5.2 Fixed in — No fix listed CNA
- alextselegidis/easyappointments (Packagist) Vendor— Affected — Fixed in — No fix listed GHSA-4vmm-5qvc-w5p7
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55651
- 2026-10-03 Alias added: GHSA-4vmm-5qvc-w5p7
References
Other 4
- https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-4vmm-5qvc-w5p7
- https://github.com/alextselegidis/easyappointments/commit/ebbe41130dafa58b0716426c56c8cfd4c22dbceb
- 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-2026-55651 · CVE Program
- CVE-2026-55651 · NVD
- FIRST EPSS
- GHSA-4vmm-5qvc-w5p7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences