# CVE-2023-37524: HCL Traveler for Microsoft Outlook (HTMO) is susceptible to vulnerabilities due to .NET Framework 4.5 being out of service.


- **Severity:** High 7.7 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 27 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** GHSA-vp5c-23j8-3fh2

## What is CVE-2023-37524?

CVE-2023-37524 is a high-severity vulnerability in HCLSoftware Traveler for Microsoft Outlook, published on 27 Jun 2026. 

### Official description

HCL Traveler for Microsoft Outlook (HTMO) is susceptible to vulnerabilities due to .NET Framework 4.5 being out of service.  Since .NET Framework 4.5 has reached end-of-life and no longer receives security updates, it may expose the application to publicly known security weaknesses through vulnerable third-party components.

Weakness: CWE-1104 (Use of Unmaintained Third Party Components)

## Which versions are affected by CVE-2023-37524?

It affects 1 product.


Products: Hcltech Traveler for Microsoft Outlook.

## How do I fix CVE-2023-37524?

No fix has been published for CVE-2023-37524 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-37524 being exploited?

There is no known exploitation of CVE-2023-37524 in the wild and no public exploit code.

## Other vulnerabilities in HCLSoftware Traveler for Microsoft Outlook

- [CVE-2024-23581](https://insights.sbomify.com/CVE-2024-23581/): HCL Traveler for Microsoft Outlook (HTMO) is susceptible to an application modification vulnerability (medium 6.7)
- [CVE-2024-30134](https://insights.sbomify.com/CVE-2024-30134/): HCL Traveler for Microsoft Outlook (HTMO) is susceptible to an application modification vulnerability (medium 6.7)
- [CVE-2024-42190](https://insights.sbomify.com/CVE-2024-42190/): HCL Traveler for Microsoft Outlook (HTMO) is susceptible to DLL hijacking (medium 6.5)
- [CVE-2024-42191](https://insights.sbomify.com/CVE-2024-42191/): HCL Traveler for Microsoft Outlook (HTMO) is susceptible to COM hijacking (medium 6.5)
- [CVE-2025-59868](https://insights.sbomify.com/CVE-2025-59868/): HCL Traveler for Microsoft Outlook (HTMO) is susceptible to sensitive data exposure (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-37524 and fix it if it is affected.

What it is: CVE-2023-37524 is a high-severity vulnerability in HCLSoftware Traveler for Microsoft Outlook, published on 27 Jun 2026. 
Exploitation: There is no known exploitation of CVE-2023-37524 in the wild and no public exploit code.

Affected product: HCLSoftware Traveler for Microsoft Outlook. 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-2023-37524/ (Markdown: https://insights.sbomify.com/CVE-2023-37524/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-37524
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-37524
- OSV: https://osv.dev/vulnerability/CVE-2023-37524

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-37524/
Summaries are generated and may contain mistakes; the official description above is the record.