CVE-2026-18777Network attack vector

Unauthenticated status tampering via update_appointment_status

Published Aug 19, 2026 · Updated Aug 19, 2026

Missing authorization in TrueBooker before 1.2.7 allows remote attackers to change appointment statuses via an AJAX action. The update_appointment_status handler accepts appointment identifiers and status values from unauthenticated requests and applies the change without verifying caller identity, ownership, or allowed state transitions. Any site exposing the plugin's front-end AJAX endpoint can have arbitrary bookings moved into attacker-chosen states, and affected customers can receive false notification emails.

CVSS severity5.3
Medium
EPSS probability0.22%
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 TrueBooker before 1.2.7 allows remote attackers to change appointment statuses via an AJAX action. The update_appointment_status handler accepts appointment identifiers and status values from unauthenticated requests and applies the change without verifying caller identity, ownership, or allowed state transitions. Any site exposing the plugin's front-end AJAX endpoint can have arbitrary bookings moved into attacker-chosen states, and affected customers can receive false notification emails.

The record

CVE
CVE-2026-18777
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
ThemetechMount
Product
TrueBooker
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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 <1.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThemetechMount · TrueBookerversion=0 <1.2.7

Published CVSS scores

5.3CISA-ADPCVSS: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
T1565.001Stored Data Manipulation

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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