# CVE-2024-47772: Cross-site Scripting (XSS) via chat excerpts when content security policy (CSP) disabled in Discourse

> Attackers can execute arbitrary JavaScript via crafted chat messages in Discourse forums if Content Security Policy is disabled, potentially compromising user accounts.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Oct 2024
- **Updated:** 8 Oct 2024
- **Also known as:** BIT-discourse-2024-47772, GHSA-67mh-xhmf-c56h

## What is CVE-2024-47772?

CVE-2024-47772 is a medium-severity cross-site scripting vulnerability in Discourse Discourse, published on 7 Oct 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Discourse is an open source platform for community discussion. An attacker can execute arbitrary JavaScript on users' browsers by sending a maliciously crafted chat message and replying to it. This issue only affects sites with CSP disabled. This problem is patched in the latest version of Discourse. All users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum. Users who do upgrade should also consider enabling a CSP as well as a proactive measure.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2024-47772?

1 open source package ship an affected version, including discourse. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `discourse` | Bitnami | All versions | 3.3.2 |

Products: Discourse Discourse.

## How do I fix CVE-2024-47772?

Upgrade discourse to 3.3.2 or later.

## Is CVE-2024-47772 being exploited?

There is no known exploitation of CVE-2024-47772 in the wild and no public exploit code.

## Other vulnerabilities in Discourse Discourse

- [CVE-2021-41163](https://insights.sbomify.com/CVE-2021-41163/): RCE via malicious SNS subscription payload (critical 10.0)
- [CVE-2022-36066](https://insights.sbomify.com/CVE-2022-36066/): Discourse vulnerable to RCE via admins uploading maliciously zipped file (critical 9.1)
- [CVE-2022-39356](https://insights.sbomify.com/CVE-2022-39356/): Discourse user account takeover via email and invite link (high 8.9)
- [CVE-2023-22468](https://insights.sbomify.com/CVE-2023-22468/): Discourse vulnerable to Cross-site Scripting in local oneboxes (high 8.8)
- [CVE-2026-27934](https://insights.sbomify.com/CVE-2026-27934/): Discourse leaks private topic title and post excerpt via user action API endpoint (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-47772 and fix it if it is affected.

What it is: CVE-2024-47772 is a medium-severity cross-site scripting vulnerability in Discourse Discourse, published on 7 Oct 2024. 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-2024-47772 in the wild and no public exploit code.

Affected packages and fixed versions:
- discourse (Bitnami): affected all versions; fixed in 3.3.2

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-2024-47772/ (Markdown: https://insights.sbomify.com/CVE-2024-47772/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47772
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47772
- OSV: https://osv.dev/vulnerability/CVE-2024-47772

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47772/
Summaries are generated and may contain mistakes; the official description above is the record.