# CVE-2023-5340: Five Star Restaurant Menu and Food Ordering < 2.4.11 - Unauthenticated PHP Object Injection

> Unauthenticated attackers can trigger PHP object injection via AJAX, potentially leading to code execution if suitable gadgets exist.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Nov 2023
- **Updated:** 21 Nov 2024
- **Also known as:** GHSA-v88m-92x2-qxm5

## What is CVE-2023-5340?

CVE-2023-5340 is a critical unsafe deserialization vulnerability in Unknown Five Star Restaurant Menu and Food Ordering, published on 20 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Five Star Restaurant Menu and Food Ordering WordPress plugin before 2.4.11 unserializes user input via an AJAX action available to unauthenticated users, allowing them to perform PHP Object Injection when a suitable gadget is present on the blog.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2023-5340?

It affects 1 product.


Products: Fivestarplugins Five Star Restaurant Menu.

## How do I fix CVE-2023-5340?

No fix has been published for CVE-2023-5340 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5340 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5340 exists.

## Other vulnerabilities in Unknown Five Star Restaurant Menu and Food Ordering

- [CVE-2020-29045](https://insights.sbomify.com/CVE-2020-29045/): Deserialization in n/a (critical 9.8)
- [CVE-2023-34017](https://insights.sbomify.com/CVE-2023-34017/): WordPress Five Star Restaurant Reservations Plugin <= 2.6.7 is vulnerable to Cross Site Scripting (XSS) (high 7.1)
- [CVE-2024-24838](https://insights.sbomify.com/CVE-2024-24838/): WordPress Five Star Restaurant Reviews Plugin <= 2.3.5 is vulnerable to Cross Site Scripting (XSS) (medium 6.5)
- [CVE-2024-5459](https://insights.sbomify.com/CVE-2024-5459/): Restaurant Menu and Food Ordering <= 2.4.16 - Missing Authorization to Menu Creation (medium 4.3)
- [CVE-2023-37985](https://insights.sbomify.com/CVE-2023-37985/): WordPress Five Star Restaurant Menu Plugin <= 2.4.6 is vulnerable to Cross Site Request Forgery (CSRF) (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5340 and fix it if it is affected.

What it is: CVE-2023-5340 is a critical unsafe deserialization vulnerability in Unknown Five Star Restaurant Menu and Food Ordering, published on 20 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5340 exists.

Affected product: Unknown Five Star Restaurant Menu and Food Ordering. 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-2023-5340/ (Markdown: https://insights.sbomify.com/CVE-2023-5340/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5340
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5340
- OSV: https://osv.dev/vulnerability/CVE-2023-5340

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5340/
Summaries are generated and may contain mistakes; the official description above is the record.