# CVE-2024-21838: Cross-site scripting in Command Centre Server

> Attackers can inject HTML into generated emails via the Command Centre Server, potentially executing malicious scripts in recipients' email clients.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 Mar 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-jg3j-pgx3-878w

## What is CVE-2024-21838?

CVE-2024-21838 is a medium-severity cross-site scripting vulnerability in Gallagher  Command Centre Server, published on 5 Mar 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Improper neutralization of special elements in output (CWE-74) used by the email generation feature of the Command Centre Server could lead to HTML code injection in emails generated by Command Centre. 

This issue affects: Gallagher Command Centre 9.00 prior to vEL9.00.1774 (MR2), 8.90 prior to vEL8.90.1751 (MR3), 8.80 prior to vEL8.80.1526 (MR4), 8.70 prior to vEL8.70.2526 (MR6),  all version of 8.60 and prior.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2024-21838?

It affects 1 product.


Products: Gallagher Command Centre.

## How do I fix CVE-2024-21838?

No fix has been published for CVE-2024-21838 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-21838 being exploited?

There is no known exploitation of CVE-2024-21838 in the wild and no public exploit code.

## Other vulnerabilities in Gallagher  Command Centre Server

- [CVE-2021-23140](https://insights.sbomify.com/CVE-2021-23140/): Missing authorization in Command Centre (critical 9.9)
- [CVE-2021-23230](https://insights.sbomify.com/CVE-2021-23230/): SQL injection in Command Centre (critical 9.9)
- [CVE-2020-16096](https://insights.sbomify.com/CVE-2020-16096/): Missing authorization in Command Centre (critical 9.9)
- [CVE-2020-16098](https://insights.sbomify.com/CVE-2020-16098/): Information disclosure in Command Centre (critical 9.8)
- [CVE-2019-15294](https://insights.sbomify.com/CVE-2019-15294/): Information disclosure in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-21838 and fix it if it is affected.

What it is: CVE-2024-21838 is a medium-severity cross-site scripting vulnerability in Gallagher  Command Centre Server, published on 5 Mar 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-21838 in the wild and no public exploit code.

Affected product: Gallagher  Command Centre Server. 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-2024-21838/ (Markdown: https://insights.sbomify.com/CVE-2024-21838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-21838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-21838
- OSV: https://osv.dev/vulnerability/CVE-2024-21838

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-21838/
Summaries are generated and may contain mistakes; the official description above is the record.