# CVE-2021-24232: Advanced Booking Calendar < 1.6.8 - Authenticated Reflected Cross-Site Scripting (XSS)

> Authenticated attackers can inject malicious scripts via unsanitized license error messages in the Advanced Booking Calendar plugin settings.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mxq8-qjm4-g6gq

## What is CVE-2021-24232?

CVE-2021-24232 is a medium-severity cross-site scripting vulnerability in Unknown Advanced Booking Calendar, published on 22 Apr 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Advanced Booking Calendar WordPress plugin before 1.6.8 does not sanitise the license error message when output in the settings page, leading to an authenticated reflected Cross-Site Scripting issue

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-24232?

It affects 1 product.


Products: Elbtide Advanced Booking Calendar.

## How do I fix CVE-2021-24232?

No fix has been published for CVE-2021-24232 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24232 being exploited?

There is no known exploitation of CVE-2021-24232 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Advanced Booking Calendar

- [CVE-2022-45822](https://insights.sbomify.com/CVE-2022-45822/): WordPress Advanced Booking Calendar Plugin <= 1.7.1 is vulnerable to SQL Injection (critical 10.0)
- [CVE-2022-0694](https://insights.sbomify.com/CVE-2022-0694/): Advanced Booking Calendar < 1.7.0 - Unauthenticated SQL Injection (critical 9.8)
- [CVE-2022-1006](https://insights.sbomify.com/CVE-2022-1006/): Advanced Booking Calendar < 1.7.1 - Admin+ SQLi (high 7.2)
- [CVE-2022-1007](https://insights.sbomify.com/CVE-2022-1007/): Advanced Booking Calendar < 1.7.1 - Reflected Cross-Site Scripting (medium 6.1)
- [CVE-2022-45824](https://insights.sbomify.com/CVE-2022-45824/): WordPress Advanced Booking Calendar Plugin <= 1.7.1 is vulnerable to Cross Site Request Forgery (CSRF) (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24232 and fix it if it is affected.

What it is: CVE-2021-24232 is a medium-severity cross-site scripting vulnerability in Unknown Advanced Booking Calendar, published on 22 Apr 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24232 in the wild and no public exploit code.

Affected product: Unknown Advanced 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-2021-24232/ (Markdown: https://insights.sbomify.com/CVE-2021-24232/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24232
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24232
- OSV: https://osv.dev/vulnerability/CVE-2021-24232

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24232/
Summaries are generated and may contain mistakes; the official description above is the record.