# CVE-2020-4018: Cross-site request forgery in Crucible

> Remote attackers can complete the setup process via CSRF, potentially gaining unauthorized administrative access to Atlassian Fisheye and Crucible instances.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Jun 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-p24q-jv27-xq4x

## What is CVE-2020-4018?

CVE-2020-4018 is a high-severity vulnerability in Atlassian Crucible, published on 1 Jun 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The setup resources in Atlassian Fisheye and Crucible before version 4.8.1 allows remote attackers to complete the setup process via a cross-site request forgery (CSRF) vulnerability.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2020-4018?

It affects 2 products.


Products: Atlassian Crucible, Atlassian Fisheye.

## How do I fix CVE-2020-4018?

No fix has been published for CVE-2020-4018 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4018 being exploited?

There is no known exploitation of CVE-2020-4018 in the wild and no public exploit code.

## Other vulnerabilities in Atlassian Crucible

- [CVE-2021-43958](https://insights.sbomify.com/CVE-2021-43958/): Security feature bypass in Crucible (critical 9.8)
- [CVE-2017-16861](https://insights.sbomify.com/CVE-2017-16861/): Code injection in Fisheye and Crucible (critical 9.8)
- [CVE-2017-14591](https://insights.sbomify.com/CVE-2017-14591/): Command injection in Fisheye and Crucible (critical 9.0)
- [CVE-2018-13399](https://insights.sbomify.com/CVE-2018-13399/): Privilege escalation in Fisheye and Crucible (high 7.8)
- [CVE-2021-43957](https://insights.sbomify.com/CVE-2021-43957/): Path traversal in Crucible (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4018 and fix it if it is affected.

What it is: CVE-2020-4018 is a high-severity vulnerability in Atlassian Crucible, published on 1 Jun 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-4018 in the wild and no public exploit code.

Affected product: Atlassian Crucible. 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-2020-4018/ (Markdown: https://insights.sbomify.com/CVE-2020-4018/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4018
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4018
- OSV: https://osv.dev/vulnerability/CVE-2020-4018

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4018/
Summaries are generated and may contain mistakes; the official description above is the record.