# CVE-2018-11565: Information disclosure in n/a

> Mahara discloses registered usernames via mention functionality, allowing attackers to enumerate valid accounts.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 May 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-fx2f-r5xx-vf9m

## What is CVE-2018-11565?

CVE-2018-11565 is a medium-severity vulnerability in Mahara Mahara, published on 30 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mahara 17.04 before 17.04.8 and 17.10 before 17.10.5 and 18.04 before 18.04.1 are vulnerable to mentioning the usernames that are already taken by people registered in the system rather than masking that information.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2018-11565?

It affects 1 product.


Products: Mahara Mahara.

## How do I fix CVE-2018-11565?

No fix has been published for CVE-2018-11565 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-11565 being exploited?

There is no known exploitation of CVE-2018-11565 in the wild and no public exploit code.

## Other vulnerabilities in Mahara Mahara

- [CVE-2022-45134](https://insights.sbomify.com/CVE-2022-45134/): Deserialization in n/a (critical 9.8)
- [CVE-2022-44544](https://insights.sbomify.com/CVE-2022-44544/): Command injection in n/a (critical 9.8)
- [CVE-2021-40849](https://insights.sbomify.com/CVE-2021-40849/): Auth bypass in n/a (critical 9.8)
- [CVE-2017-1000152](https://insights.sbomify.com/CVE-2017-1000152/): Auth bypass in n/a (critical 9.8)
- [CVE-2017-1000153](https://insights.sbomify.com/CVE-2017-1000153/): Auth bypass in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-11565 and fix it if it is affected.

What it is: CVE-2018-11565 is a medium-severity vulnerability in Mahara Mahara, published on 30 May 2018. 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-2018-11565 in the wild and no public exploit code.

Affected product: Mahara Mahara. 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-2018-11565/ (Markdown: https://insights.sbomify.com/CVE-2018-11565/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-11565
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-11565
- OSV: https://osv.dev/vulnerability/CVE-2018-11565

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-11565/
Summaries are generated and may contain mistakes; the official description above is the record.