Appointment Hour Booking < 1.5.88 - Unauthenticated Booking Price Manipulation via tcost Parameter
Priority LOW 30CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
Summary
The Appointment Hour Booking WordPress plugin before 1.5.88 does not validate a client-supplied booking price against the server-side configured service price, allowing unauthenticated users to submit an arbitrary final price (including zero or negative) that is stored as the authoritative booking price, corrupting booking and payment records.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00304 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Appointment Hour Booking (Unknown): 1.5.88
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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 |
|---|---|---|---|---|---|
| Unknown | Appointment Hour Booking | before 1.5.88 | 1.5.88 | Patch available | CNA |
- Appointment Hour Booking VendorUnknown Affected before 1.5.88 Fixed in 1.5.88 Patch available CNA
Remediation
- Fix · CNA Appointment Hour Booking (Unknown) Fixed in 1.5.88
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16282
- 2026-10-03 Alias added: GHSA-r9q4-xcm5-g5ww
References
Sources
- CVE-2026-16282 · CVE Program
- CVE-2026-16282 · NVD
- FIRST EPSS
- GHSA-r9q4-xcm5-g5ww · GitHub Advisory Database · CC BY 4.0
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