# CVE-2019-20100: Cross-site request forgery in Application Links

> An attacker can trick an admin into performing actions that enumerate internal network hosts and ports via CSRF in the Atlassian Application Links plugin.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N`)
- **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:** 12 Feb 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-mjf6-gmwv-grxx

## What is CVE-2019-20100?

CVE-2019-20100 is a medium-severity vulnerability in Atlassian Jira, published on 12 Feb 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 Atlassian Application Links plugin is vulnerable to cross-site request forgery (CSRF). The following versions are affected: all versions prior to 5.4.21, from version 6.0.0 before version 6.0.12, from version 6.1.0 before version 6.1.2, from version 7.0.0 before version 7.0.2, and from version 7.1.0 before version 7.1.3. The vulnerable plugin is used by Atlassian Jira Server and Data Center before version 8.7.0. An attacker could exploit this by tricking an administrative user into making malicious HTTP requests, allowing the attacker to enumerate hosts and open ports on the internal network where Jira server is present.

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

## Which versions are affected by CVE-2019-20100?

It affects 3 products.


Products: Atlassian Jira, Atlassian Jira Data Center, Atlassian Jira Server.

## How do I fix CVE-2019-20100?

No fix has been published for CVE-2019-20100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-20100 being exploited?

There is no known exploitation of CVE-2019-20100 in the wild and no public exploit code.

## Other vulnerabilities in Atlassian Jira

- [CVE-2020-14172](https://insights.sbomify.com/CVE-2020-14172/): Deserialization in Jira Server (critical 9.8)
- [CVE-2019-20409](https://insights.sbomify.com/CVE-2019-20409/): Code injection in Jira Server (critical 9.8)
- [CVE-2017-5983](https://insights.sbomify.com/CVE-2017-5983/): Deserialization in n/a (critical 9.8)
- [CVE-2010-1165](https://insights.sbomify.com/CVE-2010-1165/): Code injection in n/a (critical 9.0)
- [CVE-2016-4319](https://insights.sbomify.com/CVE-2016-4319/): Cross-site request forgery in Atlassian JIRA Server before 7.1.9 (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20100 and fix it if it is affected.

What it is: CVE-2019-20100 is a medium-severity vulnerability in Atlassian Jira, published on 12 Feb 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-2019-20100 in the wild and no public exploit code.

Affected product: Atlassian Jira. 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-2019-20100/ (Markdown: https://insights.sbomify.com/CVE-2019-20100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20100
- OSV: https://osv.dev/vulnerability/CVE-2019-20100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-20100/
Summaries are generated and may contain mistakes; the official description above is the record.