# CVE-2025-12842: Booking Plugin for WordPress Appointments – Time Slot <= 1.4.7 - Unauthenticated Arbitrary Email Sending

> Unauthenticated attackers can send arbitrary emails via the plugin, enabling spam or phishing campaigns.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Nov 2025
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-474f-9w4x-43hr

## What is CVE-2025-12842?

CVE-2025-12842 is a medium-severity vulnerability in timeslotplugins Time Slot – Booking and Appointment System, published on 19 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-12842?


## How do I fix CVE-2025-12842?

No fix has been published for CVE-2025-12842 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12842 being exploited?

There is no known exploitation of CVE-2025-12842 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12842 and fix it if it is affected.

What it is: CVE-2025-12842 is a medium-severity vulnerability in timeslotplugins Time Slot – Booking and Appointment System, published on 19 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-12842 in the wild and no public exploit code.

Affected product: timeslotplugins Time Slot – Booking and Appointment System. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-12842/ (Markdown: https://insights.sbomify.com/CVE-2025-12842/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12842
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12842
- OSV: https://osv.dev/vulnerability/CVE-2025-12842

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12842/
Summaries are generated and may contain mistakes; the official description above is the record.