# CVE-2019-20102: Cross-site scripting in Confluence Server

> Remote attackers can execute stored cross-site scripting via malicious attachments with modified MIME types in Atlassian Confluence Server.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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:** 22 Apr 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-65gh-pwxv-875j

## What is CVE-2019-20102?

CVE-2019-20102 is a medium-severity cross-site scripting vulnerability in Atlassian Confluence Server, published on 22 Apr 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 attachment-uploading feature in Atlassian Confluence Server from version 6.14.0 through version 6.14.3, and version 6.15.0 before version 6.15.5 allows remote attackers to achieve stored cross-site- scripting (SXSS) via a malicious attachment with a modified `mimeType` parameter.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2019-20102?

It affects 1 product.


Products: Atlassian Confluence Server.

## How do I fix CVE-2019-20102?

No fix has been published for CVE-2019-20102 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-20102 being exploited?

There is no known exploitation of CVE-2019-20102 in the wild and no public exploit code.

## Other vulnerabilities in Atlassian Confluence Server

- [CVE-2019-3396](https://insights.sbomify.com/CVE-2019-3396/): Atlassian Confluence Server and Data Center Server-Side Template Injection (critical 9.8, exploited in the wild)
- [CVE-2019-3398](https://insights.sbomify.com/CVE-2019-3398/): Atlassian Confluence Server and Data Center Path Traversal (high 8.8, exploited in the wild)
- [CVE-2017-7415](https://insights.sbomify.com/CVE-2017-7415/): Auth bypass in n/a (high 7.5)
- [CVE-2016-6668](https://insights.sbomify.com/CVE-2016-6668/): Information disclosure in n/a (high 7.5)
- [CVE-2012-6342](https://insights.sbomify.com/CVE-2012-6342/): Cross-site request forgery in n/a (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20102 and fix it if it is affected.

What it is: CVE-2019-20102 is a medium-severity cross-site scripting vulnerability in Atlassian Confluence Server, published on 22 Apr 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-2019-20102 in the wild and no public exploit code.

Affected product: Atlassian Confluence Server. 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-2019-20102/ (Markdown: https://insights.sbomify.com/CVE-2019-20102/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20102
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20102
- OSV: https://osv.dev/vulnerability/CVE-2019-20102

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-20102/
Summaries are generated and may contain mistakes; the official description above is the record.