# CVE-2023-39343: Sulu Observable Response Discrepancy on Admin Login

> An attacker can enumerate valid usernames via the admin login form, revealing which users exist in the system.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **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:** 4 Aug 2023
- **Updated:** 3 Oct 2024
- **Also known as:** GHSA-wmwf-49vv-p3mr

## What is CVE-2023-39343?

CVE-2023-39343 is a medium-severity vulnerability in sulu, published on 4 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.

Weakness: CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2023-39343?

2 open source packages ship an affected version, including sulu/sulu. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `sulu/sulu` | Packagist | From 2.5.0 | 2.5.10 |
| `sulu/sulu` | Packagist | From 2.5.0 | 2.5.10 |

Products: Sulu Sulu.

## How do I fix CVE-2023-39343?

Upgrade sulu/sulu to 2.5.10 or later.

## Is CVE-2023-39343 being exploited?

There is no known exploitation of CVE-2023-39343 in the wild and no public exploit code.

## Other vulnerabilities in sulu

- [CVE-2021-43836](https://insights.sbomify.com/CVE-2021-43836/): PHP file inclusion in the Sulu admin panel (high 8.5)
- [CVE-2021-32737](https://insights.sbomify.com/CVE-2021-32737/): XSS Injection in Media Collection Title was possible (high 8.4)
- [CVE-2021-43835](https://insights.sbomify.com/CVE-2021-43835/): Privilege escalation in the Sulu Admin panel (high 7.2)
- [CVE-2024-27915](https://insights.sbomify.com/CVE-2024-27915/): Sulu grants access to pages regardless of role permissions (medium 6.8)
- [CVE-2021-41169](https://insights.sbomify.com/CVE-2021-41169/): Improper Neutralization HTML tags in sulu/sulu (medium 6.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-39343 and fix it if it is affected.

What it is: CVE-2023-39343 is a medium-severity vulnerability in sulu, published on 4 Aug 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-2023-39343 in the wild and no public exploit code.

Affected packages and fixed versions:
- sulu/sulu (Packagist): affected from 2.5.0; fixed in 2.5.10
- sulu/sulu (Packagist): affected from 2.5.0; fixed in 2.5.10

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-2023-39343/ (Markdown: https://insights.sbomify.com/CVE-2023-39343/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-39343
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-39343
- OSV: https://osv.dev/vulnerability/CVE-2023-39343

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-39343/
Summaries are generated and may contain mistakes; the official description above is the record.