# CVE-2019-3803: Concourse includes token in CLI authentication callback

> Attackers can steal user access tokens from browser history to impersonate users and access Concourse CI resources.

- **Severity:** Medium 4.5 (`CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Jan 2019
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-9xg8-22rr-c6vh

## What is CVE-2019-3803?

CVE-2019-3803 is a medium-severity vulnerability in Pivotal Concourse, published on 12 Jan 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Pivotal Concourse, all versions prior to 4.2.2, puts the user access token in a url during the login flow. A remote attacker who gains access to a user's browser history could obtain the access token and use it to authenticate as the user.

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

## Which versions are affected by CVE-2019-3803?

It affects 1 product.


Products: Pivotal Software Concourse.

## How do I fix CVE-2019-3803?

No fix has been published for CVE-2019-3803 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3803 being exploited?

There is no known exploitation of CVE-2019-3803 in the wild and no public exploit code.

## Other vulnerabilities in Pivotal Concourse

- [CVE-2020-5415](https://insights.sbomify.com/CVE-2020-5415/): Concourse's GitLab auth allows impersonation (critical 10.0)
- [CVE-2020-5409](https://insights.sbomify.com/CVE-2020-5409/): Concourse Open Redirect in the /sky/login endpoint (high 7.6)
- [CVE-2018-15798](https://insights.sbomify.com/CVE-2018-15798/): Pivotal Concourse allows malicious redirect urls on login (high 7.6)
- [CVE-2018-1227](https://insights.sbomify.com/CVE-2018-1227/): Supply chain in Concourse CI: As of 2018-03-13, Pivotal does not believe that any resources or builds of Concourse have been compromised. (high 7.5)
- [CVE-2019-3792](https://insights.sbomify.com/CVE-2019-3792/): Concourse 5.0.0 SQL Injection vulnerability (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3803 and fix it if it is affected.

What it is: CVE-2019-3803 is a medium-severity vulnerability in Pivotal Concourse, published on 12 Jan 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-3803 in the wild and no public exploit code.

Affected product: Pivotal Concourse. 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-2019-3803/ (Markdown: https://insights.sbomify.com/CVE-2019-3803/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3803
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3803
- OSV: https://osv.dev/vulnerability/CVE-2019-3803

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3803/
Summaries are generated and may contain mistakes; the official description above is the record.