Knight Squad Academy
Vulnerability advisory

CVE-2025-12842

Research by Md. Moniruzzaman Prodhan November 19, 2025
Overview

Summary

The Booking Plugin for WordPress Appointments – Time Slot plugin for WordPress is vulnerable to unauthorized email sending in versions up to, and including, 1.4.7 due to missing validation on the tslot_appt_email AJAX action. This makes it possible for unauthenticated attackers to send appointment notification emails to arbitrary recipients with attacker-controlled text content in certain email fields, potentially enabling the site to be abused for phishing campaigns or spam distribution.

Risk profile

CVSS assessment

5.3 · M E D I U M
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
N E T W O R K
Complexity
L O W
Privileges
N O N E
User interaction
N O N E
Scope
U N C H A N G E D
Confidentiality
N O N E
Integrity
L O W
Availability
N O N E
Classification

Weaknesses

  • Improper Input Validation CWE-20
Further reading

References

4 sources
  1. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/timeslot/tags/1.4.6/public/form/email.php#L21
  2. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/timeslot/tags/1.4.6/public/form/email.php#L23
  3. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3397527%40timeslot&new=3397527%40timeslot&sfp_email=&sfph_mail=
  4. www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/087b6943-5da8-44fe-8614-832768444178?source=cve