# CVE-2020-11021: HTTP request which redirect to another hostname do not strip authorization header in Actions Http-Client

> Attackers can steal authorization headers when HTTP requests redirect to a different domain, exposing sensitive credentials to unintended hosts.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-9w6v-m7wp-jwg4

## What is CVE-2020-11021?

CVE-2020-11021 is a medium-severity vulnerability in actions http-client, published on 29 Apr 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Actions Http-Client (NPM @actions/http-client) before version 1.0.8 can disclose Authorization headers to incorrect domain in certain redirect scenarios. The conditions in which this happens are if consumers of the http-client: 1. make an http request with an authorization header 2. that request leads to a redirect (302) and 3. the redirect url redirects to another domain or hostname Then the authorization header will get passed to the other domain. The problem is fixed in version 1.0.8.

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

## Which versions are affected by CVE-2020-11021?

2 open source packages ship an affected version, including @actions/http-client. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@actions/http-client` | npm | All versions | 1.0.8 |
| `@actions/http-client` | npm | All versions | 1.0.8 |

Products: Http-Client Project Http-Client.

## How do I fix CVE-2020-11021?

Upgrade @actions/http-client to 1.0.8 or later.

## Is CVE-2020-11021 being exploited?

There is no known exploitation of CVE-2020-11021 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11021 and fix it if it is affected.

What it is: CVE-2020-11021 is a medium-severity vulnerability in actions http-client, published on 29 Apr 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-11021 in the wild and no public exploit code.

Affected packages and fixed versions:
- @actions/http-client (npm): affected all versions; fixed in 1.0.8
- @actions/http-client (npm): affected all versions; fixed in 1.0.8

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-2020-11021/ (Markdown: https://insights.sbomify.com/CVE-2020-11021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11021
- OSV: https://osv.dev/vulnerability/CVE-2020-11021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11021/
Summaries are generated and may contain mistakes; the official description above is the record.