# CVE-2022-23548: Denial of service in discourse

> Attackers can cause denial of service in Discourse forums via regular expression denial of service attacks during post parsing.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Jan 2023
- **Updated:** 10 Mar 2025
- **Also known as:** BIT-discourse-2022-23548, GHSA-7rw2-f4x7-7pxf

## What is CVE-2022-23548?

CVE-2022-23548 is a medium-severity denial of service vulnerability in Discourse Discourse, published on 5 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Discourse is an option source discussion platform. Prior to version 2.8.14 on the `stable` branch and version 2.9.0.beta16 on the `beta` and `tests-passed` branches, parsing posts can be susceptible to regular expression denial of service (ReDoS) attacks. This issue is patched in versions 2.8.14 and 2.9.0.beta16. There are no known workarounds.

Weakness: CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2022-23548?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `discourse` | Bitnami | All versions | 2.8.14 |

Products: Discourse Discourse.

## How do I fix CVE-2022-23548?

Upgrade discourse to 2.8.14 or later.

## Is CVE-2022-23548 being exploited?

There is no known exploitation of CVE-2022-23548 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-2022-23548 and fix it if it is affected.

What it is: CVE-2022-23548 is a medium-severity denial of service vulnerability in Discourse Discourse, published on 5 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-23548 in the wild and no public exploit code.

Affected packages and fixed versions:
- discourse (Bitnami): affected all versions; fixed in 2.8.14

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-2022-23548/ (Markdown: https://insights.sbomify.com/CVE-2022-23548/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-23548
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-23548
- OSV: https://osv.dev/vulnerability/CVE-2022-23548

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-23548/
Summaries are generated and may contain mistakes; the official description above is the record.