# CVE-2019-20105: Missing authorization in Application Links

> Remote attackers with admin session access bypass WebSudo re-authentication in Atlassian Application Links, allowing unauthorized access to sensitive servlet resources.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Mar 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-hhrj-8h23-4fr8

## What is CVE-2019-20105?

CVE-2019-20105 is a medium-severity missing authorization vulnerability in Atlassian Application Links, published on 17 Mar 2020. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The EditApplinkServlet resource in the Atlassian Application Links plugin before version 5.4.20, 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 7.0.1, and from version 7.1.0 before version 7.1.3 allows remote attackers who have obtained access to administrator's session to access the EditApplinkServlet resource without needing to re-authenticate to pass "WebSudo" in products that support "WebSudo" through an improper access control vulnerability.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2019-20105?

It affects 1 product.


Products: Atlassian Application Links.

## How do I fix CVE-2019-20105?

No fix has been published for CVE-2019-20105 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-20105 being exploited?

There is no known exploitation of CVE-2019-20105 in the wild and no public exploit code.

## Other vulnerabilities in Atlassian Application Links

- [CVE-2017-18111](https://insights.sbomify.com/CVE-2017-18111/): XML external entity in Application Links (high 8.7)
- [CVE-2017-18096](https://insights.sbomify.com/CVE-2017-18096/): Server-side request forgery in Atlassian Application Links (high 7.2)
- [CVE-2017-16860](https://insights.sbomify.com/CVE-2017-16860/): Cross-site scripting in Application Links (medium 6.1)
- [CVE-2018-20239](https://insights.sbomify.com/CVE-2018-20239/): Cross-site scripting in Atlassian Application Links (medium 5.4)
- [CVE-2018-5227](https://insights.sbomify.com/CVE-2018-5227/): Cross-site scripting in Atlassian Application Links (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20105 and fix it if it is affected.

What it is: CVE-2019-20105 is a medium-severity missing authorization vulnerability in Atlassian Application Links, published on 17 Mar 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-20105 in the wild and no public exploit code.

Affected product: Atlassian Application Links. 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-2019-20105/ (Markdown: https://insights.sbomify.com/CVE-2019-20105/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20105
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20105
- OSV: https://osv.dev/vulnerability/CVE-2019-20105

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-20105/
Summaries are generated and may contain mistakes; the official description above is the record.