# CVE-2026-5693: Smart Appointment & Booking <= 1.0.8 - Missing Authorization to Unauthenticated Arbitrary Booking Cancellation

> Unauthenticated attackers can cancel arbitrary bookings in the Smart Appointment & Booking WordPress plugin due to a flawed nonce validation check.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** 12 May 2026
- **Updated:** 12 May 2026
- **Also known as:** GHSA-jx49-jgx5-x37f

## What is CVE-2026-5693?

CVE-2026-5693 is a medium-severity missing authorization vulnerability in zealopensource Smart Appointment & Booking, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Smart Appointment & Booking plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check and a nonce validation logic flaw in the saab_cancel_booking() function in all versions up to, and including, 1.0.8. The nonce check uses && (AND) instead of || (OR), which means providing any value for the security parameter causes the entire check to be skipped. This makes it possible for unauthenticated attackers to cancel arbitrary bookings by supplying a predictable booking ID.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-5693?


## How do I fix CVE-2026-5693?

No fix has been published for CVE-2026-5693 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5693 being exploited?

There is no known exploitation of CVE-2026-5693 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5693 and fix it if it is affected.

What it is: CVE-2026-5693 is a medium-severity missing authorization vulnerability in zealopensource Smart Appointment & Booking, published on 12 May 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-2026-5693 in the wild and no public exploit code.

Affected product: zealopensource Smart Appointment & Booking. 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-2026-5693/ (Markdown: https://insights.sbomify.com/CVE-2026-5693/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5693
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5693
- OSV: https://osv.dev/vulnerability/CVE-2026-5693

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5693/
Summaries are generated and may contain mistakes; the official description above is the record.