CVE-2021-36778
Exposure of repository credentials to external third-party sources
A Incorrect Authorization vulnerability in SUSE Rancher allows administrators of third-party repositories to gather credentials that are sent to their servers. This issue affects: SUSE Rancher Rancher versions prior to 2.5.12; Rancher versions prior to 2.6.3.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Exposure of repository credentials to external third-party sources
A Incorrect Authorization vulnerability in SUSE Rancher allows administrators of third-party repositories to gather credentials that are sent to their servers. This issue affects: SUSE Rancher Rancher versions prior to 2.5.12; Rancher versions prior to 2.6.3.
- Record
CVE-2021-36778- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-863
- Updated
- 2026-11-02
EUVDEUVD-2022-2368
A Incorrect Authorization vulnerability in SUSE Rancher allows administrators of third-party repositories to gather credentials that are sent to their servers. This issue affects: SUSE Rancher Rancher versions prior to 2.5.12; Rancher versions prior to 2.6.3.
- Record
EUVD-2022-2368- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4fc7-hc63-7fjg
Exposure of repository credentials to external third-party sources in Rancher
Impact
This issue only happens when the user configures access credentials to a private repository in Rancher inside Apps & Marketplace > Repositories. It affects Rancher versions 2.5.0 up to and including 2.5.11 and from 2.6.0 up to and including 2.6.2.
An insufficient check of the same-origin policy when downloading Helm charts from a configured private repository can lead to exposure of the repository credentials to a third-party provider. This exposure happens when the private repository:
- Does an HTTP redirect to a third-party repository or external storage provider.
- Downloads an icon resource for the chart hosted on a third-party provider.
The address of the private repository is not leaked, only the credentials are leaked in the HTTP Authorization header in base64 format.
With the patched versions, the default behavior now is to only send the private repository credentials when subdomain or domain hostname match when following the redirect or downloading external resources.
Patches
Patched versions include releases 2.5.12, 2.6.3 and later versions.
Workarounds
- Update Rancher to a patched version.
- Check the Helm charts in your configured private repository for possible redirects to third-party storage, and for Helm chart icons from third-party sources.
- Evaluate any Helm chart that might lead to the mentioned scenario and change affected credentials if deemed necessary.
References
Information about the same-origin check and how to disable it is available in Rancher documentation.
For more information
If you have any questions or comments about this advisory:
- Reach out to SUSE Rancher Security team for security related inquiries.
- Open an issue in Rancher repository.
- Verify our support matrix and product support lifecycle.
- Record
GHSA-4fc7-hc63-7fjg- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L - Weakness
- CWE-200, CWE-522, CWE-863
- Updated
- 2026-11-02
NVD
A Incorrect Authorization vulnerability in SUSE Rancher allows administrators of third-party repositories to gather credentials that are sent to their servers. This issue affects: SUSE Rancher Rancher versions prior to 2.5.12; Rancher versions prior to 2.6.3.
- Record
CVE-2021-36778- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - 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-863
- Updated
- 2026-11-02
OSV
A Incorrect Authorization vulnerability in SUSE Rancher allows administrators of third-party repositories to gather credentials that are sent to their servers. This issue affects: SUSE Rancher Rancher versions prior to 2.5.12; Rancher versions prior to 2.6.3.
- Record
CVE-2021-36778- 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-4fc7-hc63-7fjg
Exposure of repository credentials to external third-party sources in Rancher
Impact
This issue only happens when the user configures access credentials to a private repository in Rancher inside Apps & Marketplace > Repositories. It affects Rancher versions 2.5.0 up to and including 2.5.11 and from 2.6.0 up to and including 2.6.2.
An insufficient check of the same-origin policy when downloading Helm charts from a configured private repository can lead to exposure of the repository credentials to a third-party provider. This exposure happens when the private repository:
- Does an HTTP redirect to a third-party repository or external storage provider.
- Downloads an icon resource for the chart hosted on a third-party provider.
The address of the private repository is not leaked, only the credentials are leaked in the HTTP Authorization header in base64 format.
With the patched versions, the default behavior now is to only send the private repository credentials when subdomain or domain hostname match when following the redirect or downloading external resources.
Patches
Patched versions include releases 2.5.12, 2.6.3 and later versions.
Workarounds
- Update Rancher to a patched version.
- Check the Helm charts in your configured private repository for possible redirects to third-party storage, and for Helm chart icons from third-party sources.
- Evaluate any Helm chart that might lead to the mentioned scenario and change affected credentials if deemed necessary.
References
Information about the same-origin check and how to disable it is available in Rancher documentation.
For more information
If you have any questions or comments about this advisory:
- Reach out to SUSE Rancher Security team for security related inquiries.
- Open an issue in Rancher repository.
- Verify our support matrix and product support lifecycle.
- Record
GHSA-4fc7-hc63-7fjg- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L - Weakness
- CWE-200, CWE-522, CWE-863
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/rancher/rancherGo |
2.6.0 up to 2.6.3 | 2.6.3 |
github.com/rancher/rancherGo |
2.5.0 up to 2.5.12 | 2.5.12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-36778 is a high vulnerability (CVSS 7.3) in Suse Rancher, published May 2, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.76%, the 55th percentile. Fixed in github.com/rancher/rancher 2.6.3.