# CVE-2026-12111: Appointment Booking Calendar <= 1.4.01 - Authenticated (Contributor+) Sensitive Information Exposure via 'id' Parameter

> Authenticated contributors can access sensitive customer booking data from any calendar due to missing ownership checks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jun 2026
- **Updated:** 18 Jun 2026
- **Also known as:** GHSA-w9f2-px6f-gvmg

## What is CVE-2026-12111?

CVE-2026-12111 is a medium-severity missing authorization vulnerability in codepeople Appointment Booking Calendar, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Appointment Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including, 1.4.01. This is due to insufficient authorization and missing per-calendar ownership checks in the cpabc_appointments_calendar_load2() function, which is reachable via the cpabc_calendar_load2=1 query parameter in wp-admin and only checks is_admin() && current_user_can('edit_posts'), a capability available to Contributor-level users and above. This makes it possible for authenticated attackers with Contributor-level access and above to supply an arbitrary calendar ID via the id parameter and extract customer booking information, including email addresses, names, phone numbers, booking times, and comments, from any calendar managed by the plugin.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-12111?


## How do I fix CVE-2026-12111?

No fix has been published for CVE-2026-12111 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12111 being exploited?

There is no known exploitation of CVE-2026-12111 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12111 and fix it if it is affected.

What it is: CVE-2026-12111 is a medium-severity missing authorization vulnerability in codepeople Appointment Booking Calendar, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12111 in the wild and no public exploit code.

Affected product: codepeople Appointment 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-2026-12111/ (Markdown: https://insights.sbomify.com/CVE-2026-12111/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12111
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12111
- OSV: https://osv.dev/vulnerability/CVE-2026-12111

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12111/
Summaries are generated and may contain mistakes; the official description above is the record.