Unauthenticated appointment manipulation via predictable edit keys
Published Jul 2, 2026 · Updated Jul 2, 2026
Authorization bypass in Wappointment 2.7.6 and earlier allows remote attackers to cancel or reschedule other users' appointments. The tryCancel() path and unauthenticated cancellation and rescheduling endpoints accept appointmentkey as the sole authorization token, while edit_key is an unsalted MD5 of sequential client_id, observable start_at, and enumerable staff_id values. The vulnerable operations are reachable only when cancellation or rescheduling is enabled, and a computed key permits modification of another customer's appointment.
Summary
What happened
Authorization bypass in Wappointment 2.7.6 and earlier allows remote attackers to cancel or reschedule other users' appointments. The tryCancel() path and unauthenticated cancellation and rescheduling endpoints accept appointmentkey as the sole authorization token, while edit_key is an unsalted MD5 of sequential client_id, observable start_at, and enumerable staff_id values. The vulnerable operations are reachable only when cancellation or rescheduling is enabled, and a computed key permits modification of another customer's appointment.
The record
- CVE
- CVE-2026-9188
- Published
- Jul 2, 2026
- Updated
- Jul 2, 2026
- Vendor
- Wappointment team
- Product
- Wappointment
- Classifications
- CWE-639, T1565.001, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 2, 2026CVE publishedPublication date reported by the CVE source.
- Jul 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2.7.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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