TI-2026-70736 Aliases CVE-2026-108758 GHSA-q8ph-7hq3-m5wq

Easy!Appointments authorization bypass lets attackers modify bookings

HIGH 77CWE-639Published 2026-10-11 · Updated 2026-10-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · High · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

Easy!Appointments through 1.6.0 contains an authorization bypass in Booking::register(). The function accepts a user-controlled appointment id (CWE-639) without verifying that the caller owns the appointment. An unauthenticated remote attacker can enumerate sequential appointment ids to rewrite appointment details, reassign them to attacker-controlled customers, and obtain management hashes for rescheduling or cancellation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Easy!Appointments through 1.6.0 contains an authorization bypass vulnerability in Booking::register() that allows unauthenticated attackers to modify any appointment by supplying an appointment id without its hash. Attackers can enumerate sequential appointment ids with a self-asserted manage_mode flag to rewrite appointment details, rebind them to attacker-controlled customers, and obtain management hashes for rescheduling or cancellation.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0034 27th 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: Yes
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	up to 1.6.0	—	No fix listed	CNA

easyappointments Vendoralextselegidis Affected up to 1.6.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Easy!Appointments.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-11 Threatist record created from CVE-2026-108758
2026-10-11 Alias added: GHSA-q8ph-7hq3-m5wq
2026-10-12 Priority changed: MEDIUM → LOW
2026-10-13 CISA SSVC decision points changed
2026-10-13 Priority changed: LOW → HIGH

References

Patch 1

https://github.com/alextselegidis/easyappointments/commit/09c6fb30b6aac0830a820d6bec3d2eb241daf150

Advisory 1

https://hackmd.io/@haind/easyappointments-booking-register-appointment-takeover

Other 2

TI-2023-01200 Use of Hard-coded Credentials in alextselegidis/easyappointments CVSS 3.1CRITICAL 9.8
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
TI-2026-37945 Easy!Appointments has unauthenticated customer PII disclosure on booking reschedule page CVSS 4.0MEDIUM 6.9

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences