Booking Plugin for WordPress Appointments – Time Slot <= 1.4.7 - Unauthenticated Arbitrary Email Sending
Strategic Overview
- Status
- Patched in 1.4.8
- Affected Plugin
- Time Slot – Booking and Appointment System
- Affected Version
<= 1.4.7- CVSS
- 5.3Medium
- Weakness type
- CWE-20 · Improper Input Validation
- CVE
CVE-2025-12842
At a glance
CVE-2025-12842 is a medium-severity Improper Input Validation vulnerability in the Time Slot WordPress plugin, affecting versions <= 1.4.7. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.4.8; sites on affected versions should update now. Disclosed November 2025, reported by Md. Moniruzzaman Prodhan (NomanProdhan).
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-20: Improper Input Validation
Reaching this weakness in Time Slot <= 1.4.7 takes no account at all. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.
The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Time Slot the fix is 1.4.8: builds <= 1.4.7 are affected, anything from 1.4.8 onward is not.
Remediation
Update to version 1.4.8, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Time Slot 1.4.8 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Time Slot – Booking and Appointment System
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