CVE-2020-11021
HTTP request which redirect to another hostname do not strip authorization header in Actions Http-Client
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
HTTP request which redirect to another hostname do not strip authorization header in Actions Http-Client
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.
- Record
CVE-2020-11021- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
EUVDEUVD-2020-0377
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.
- Record
EUVD-2020-0377- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9w6v-m7wp-jwg4
Http request which redirect to another hostname do not strip authorization header in @actions/http-client
Impact
If consumers of the http-client:
- make an http request with an authorization header
- that request leads to a redirect (302) and
- the redirect url redirects to another domain or hostname
The authorization header will get passed to the other domain.
Note that since this library is for actions, the GITHUB_TOKEN that is available in actions is generated and scoped per job with these permissions.
Patches
The problem is fixed in 1.0.8 at npm here. In 1.0.8, the authorization header is stripped before making the redirected request if the hostname is different.
Workarounds
None.
References
https://github.com/actions/http-client/pull/27
For more information
If you have any questions or comments about this advisory:
- Open an issue in https://github.com/actions/http-client/issues
- Record
GHSA-9w6v-m7wp-jwg4- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2020-11021- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2020-11021- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-9w6v-m7wp-jwg4
Http request which redirect to another hostname do not strip authorization header in @actions/http-client
Impact
If consumers of the http-client:
- make an http request with an authorization header
- that request leads to a redirect (302) and
- the redirect url redirects to another domain or hostname
The authorization header will get passed to the other domain.
Note that since this library is for actions, the GITHUB_TOKEN that is available in actions is generated and scoped per job with these permissions.
Patches
The problem is fixed in 1.0.8 at npm here. In 1.0.8, the authorization header is stripped before making the redirected request if the hostname is different.
Workarounds
None.
References
https://github.com/actions/http-client/pull/27
For more information
If you have any questions or comments about this advisory:
- Open an issue in https://github.com/actions/http-client/issues
- Record
GHSA-9w6v-m7wp-jwg4- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@actions/http-clientnpm |
before 1.0.8 | 1.0.8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-11021 is a medium vulnerability (CVSS 6.3) in Actions Http-client, published April 29, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.78%, the 78th percentile. Fixed in @actions/http-client 1.0.8.