CVE-2025-13317Network attack vector

Unauthenticated booking confirmation via unverified payment notifications

Published Nov 22, 2025 · Updated Apr 8, 2026

Missing authorization in CodePeople Appointment Booking Calendar 1.3.96 and earlier allows remote attackers to confirm arbitrary bookings. The cpabc_appointments_check_IPN_verification endpoint accepts the cpabc_ipncheck payment-notification parameter without validating its origin or authenticity, then inserts the booking into the live calendar. No authentication or user interaction is required, and successful requests generate administrative and customer emails while corrupting booking integrity and disrupting scheduling operations.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in CodePeople Appointment Booking Calendar 1.3.96 and earlier allows remote attackers to confirm arbitrary bookings. The cpabc_appointments_check_IPN_verification endpoint accepts the cpabc_ipncheck payment-notification parameter without validating its origin or authenticity, then inserts the booking into the live calendar. No authentication or user interaction is required, and successful requests generate administrative and customer emails while corrupting booking integrity and disrupting scheduling operations.

The record

CVE
CVE-2025-13317
Published
Nov 22, 2025
Updated
Apr 8, 2026
Vendor
CodePeople
Product
Appointment Booking Calendar
Classifications
CWE-862
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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.

  1. Affected versionversion=0 <=1.3.96

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CodePeople · Appointment Booking Calendarversion=0 <=1.3.96

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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