# CVE-2022-4036: Appointment Hour Booking <= 1.3.72 - CAPTCHA Bypass

> Attackers can bypass CAPTCHA protection in the Appointment Hour Booking WordPress plugin due to weak hashing and exposed secrets.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:** 29 Nov 2022
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-5cwm-9hm2-r3cf

## What is CVE-2022-4036?

CVE-2022-4036 is a medium-severity vulnerability in codepeople Appointment Hour Booking – Booking Calendar, published on 29 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Appointment Hour Booking plugin for WordPress is vulnerable to CAPTCHA bypass in versions up to, and including, 1.3.72. This is due to the use of insufficiently strong hashing algorithm on the CAPTCHA secret that is also displayed to the user via a cookie.

Weakness: CWE-326 (Inadequate Encryption Strength), CWE-804 (Guessable CAPTCHA)

## Which versions are affected by CVE-2022-4036?

It affects 1 product.


Products: Dwbooster Appointment Hour Booking.

## How do I fix CVE-2022-4036?

No fix has been published for CVE-2022-4036 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-4036 being exploited?

There is no known exploitation of CVE-2022-4036 in the wild and no public exploit code.

## Other vulnerabilities in codepeople Appointment Hour Booking – Booking Calendar

- [CVE-2022-4035](https://insights.sbomify.com/CVE-2022-4035/): Appointment Hour Booking <= 1.3.72 - Unauthenticated iFrame Injection via Appointment Form (high 7.2)
- [CVE-2019-13505](https://insights.sbomify.com/CVE-2019-13505/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2022-4034](https://insights.sbomify.com/CVE-2022-4034/): Appointment Hour Booking <= 1.3.72 - CSV Injection (medium 5.8)
- [CVE-2021-24712](https://insights.sbomify.com/CVE-2021-24712/): Appointment Hour Booking – WordPress Booking Plugin < 1.3.17 - Authenticated Stored XSS (medium 5.4)
- [CVE-2022-1710](https://insights.sbomify.com/CVE-2022-1710/): Appointment Hour Booking < 1.3.56 - Admin+ Stored Cross-Site Scripting (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-4036 and fix it if it is affected.

What it is: CVE-2022-4036 is a medium-severity vulnerability in codepeople Appointment Hour Booking – Booking Calendar, published on 29 Nov 2022. 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-2022-4036 in the wild and no public exploit code.

Affected product: codepeople Appointment Hour Booking – Booking Calendar. 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-2022-4036/ (Markdown: https://insights.sbomify.com/CVE-2022-4036/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-4036
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-4036
- OSV: https://osv.dev/vulnerability/CVE-2022-4036

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-4036/
Summaries are generated and may contain mistakes; the official description above is the record.