# CVE-2026-76586: BookingPress 1.5.6 - 1.6.2 - Unauthenticated Booking Price Manipulation via PayPal Payment Confirmation

> Unauthenticated attackers can manipulate booking prices by bypassing payment verification, allowing them to secure appointments for a fraction of the cost.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 Aug 2026
- **Updated:** 30 Aug 2026
- **Also known as:** GHSA-h9qm-hc3c-qpr3

## What is CVE-2026-76586?

CVE-2026-76586 is a high-severity vulnerability in Unknown Appointment Booking Calendar Plugin and Scheduling Plugin, published on 29 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Appointment Booking Calendar Plugin and Scheduling Plugin  WordPress plugin before 1.6.3 does not verify the amount actually paid against the server-side price staged for a booking when confirming an online payment, allowing unauthenticated users to have a paid appointment approved for a fraction of its price.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-76586?


## How do I fix CVE-2026-76586?

No fix has been published for CVE-2026-76586 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76586 being exploited?

There is no known exploitation of CVE-2026-76586 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76586 and fix it if it is affected.

What it is: CVE-2026-76586 is a high-severity vulnerability in Unknown Appointment Booking Calendar Plugin and Scheduling Plugin, published on 29 Aug 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-2026-76586 in the wild and no public exploit code.

Affected product: Unknown Appointment Booking Calendar Plugin and Scheduling Plugin. 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-2026-76586/ (Markdown: https://insights.sbomify.com/CVE-2026-76586/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76586
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76586
- OSV: https://osv.dev/vulnerability/CVE-2026-76586

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76586/
Summaries are generated and may contain mistakes; the official description above is the record.