CVE-2021-22862

Improper access control in GitHub Enterprise Server leading to the disclosure of Actions secrets to forks

Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with the ability to fork a repository to disclose Actions secrets for the parent repository of the fork. This vulnerability existed due to a flaw that allowed the base reference of a pull request to be updated to point to an arbitrary SHA or another pull request outside of the fork repository. By establishing this incorrect reference in a PR, the restrictions that limit the Actions secrets sent a workflow from forks could be bypassed. This vulnerability affected GitHub Enterprise Server version 3.0.0, 3.0.0.rc2, and 3.0.0.rc1. This vulnerability was reported via the GitHub Bug Bounty program.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.11%
Affected: GitHub GitHub Enterprise Server
Published at:
Updated at:

References

Link Tags
https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1

Frequently Asked Questions

What is the severity of CVE-2021-22862?
CVE-2021-22862 has been scored as a medium severity vulnerability.
How to fix CVE-2021-22862?
To fix CVE-2021-22862, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-22862 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-22862 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22862?
CVE-2021-22862 affects GitHub GitHub Enterprise Server.
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