# CVE-2023-40720: Auth bypass in FortiVoice

> Authenticated attackers can bypass authorization to read other users' SIP configurations via crafted requests in FortiVoice Enterprise.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L/E:P/RL:X/RC:C`)
- **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:** 14 May 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-wr9w-6wcp-7m3p

## What is CVE-2023-40720?

CVE-2023-40720 is a medium-severity authentication bypass vulnerability in Fortinet FortiVoice, published on 14 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An authorization bypass through user-controlled key vulnerability [CWE-639] in FortiVoiceEntreprise version 7.0.0 through 7.0.1 and before 6.4.8 allows an authenticated attacker to read the SIP configuration of other users via crafted HTTP or HTTPS requests.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2023-40720?

It affects 1 product.


Products: Fortinet Fortivoice.

## How do I fix CVE-2023-40720?

No fix has been published for CVE-2023-40720 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-40720 being exploited?

There is no known exploitation of CVE-2023-40720 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet FortiVoice

- [CVE-2023-37931](https://insights.sbomify.com/CVE-2023-37931/): SQL injection in FortiVoice (high 8.6)
- [CVE-2025-60024](https://insights.sbomify.com/CVE-2025-60024/): Path traversal in FortiVoice (high 7.7)
- [CVE-2025-58692](https://insights.sbomify.com/CVE-2025-58692/): SQL injection in FortiVoice (high 7.7)
- [CVE-2025-47856](https://insights.sbomify.com/CVE-2025-47856/): Command injection in FortiVoice (high 7.2)
- [CVE-2025-64156](https://insights.sbomify.com/CVE-2025-64156/): SQL injection in FortiVoice (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-40720 and fix it if it is affected.

What it is: CVE-2023-40720 is a medium-severity authentication bypass vulnerability in Fortinet FortiVoice, published on 14 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-40720 in the wild and no public exploit code.

Affected product: Fortinet FortiVoice. 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-2023-40720/ (Markdown: https://insights.sbomify.com/CVE-2023-40720/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-40720
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-40720
- OSV: https://osv.dev/vulnerability/CVE-2023-40720

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-40720/
Summaries are generated and may contain mistakes; the official description above is the record.