# CVE-2026-96573: Cross-site scripting in Appointment Hour Booking – Booking Calendar

> Unauthenticated attackers can inject arbitrary scripts via the booking form, executing them when users view the calendar list if specific settings are enabled.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/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:** 1 Oct 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-8899-xhvc-pc43

## What is CVE-2026-96573?

CVE-2026-96573 is a high-severity cross-site scripting vulnerability in codepeople Appointment Hour Booking – Booking Calendar, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via Booking Form Single-Line Field via Schedule Calendar List Renderer in all versions up to, and including, 1.5.97 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the 'list_readmore_numberofwords' Other Parameters setting to be configured with a positive integer value; the default value of 0 bypasses the decode-and-truncate branch entirely and is not exploitable through this sink.

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

## Which versions are affected by CVE-2026-96573?


## How do I fix CVE-2026-96573?

No fix has been published for CVE-2026-96573 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-96573 being exploited?

There is no known exploitation of CVE-2026-96573 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-96573 and fix it if it is affected.

What it is: CVE-2026-96573 is a high-severity cross-site scripting vulnerability in codepeople Appointment Hour Booking – Booking Calendar, published on 1 Oct 2026. 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-2026-96573 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-2026-96573/ (Markdown: https://insights.sbomify.com/CVE-2026-96573/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-96573
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-96573
- OSV: https://osv.dev/vulnerability/CVE-2026-96573

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-96573/
Summaries are generated and may contain mistakes; the official description above is the record.