CVE-2020-10517

Improper access control in GitHub Enterprise Server leading to the enumeration of private repository names

MEDIUM

4.3

CVSS Score

Published: August 27, 2020 at 09:55 PM UTC

Updated: June 17, 2026 at 02:47 AM UTC

2 products affected across 1 vendorGitHubGitHub Enterprise Server

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Severity

MEDIUM4.3

Exploit prediction

EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitHub · GitHub

95%

v < 2.19.212.20.0 ≤ v < 2.20.152.21.0 ≤ v < 2.21.6

Affected range stops below 2.19.21, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.20.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.21.6, so it looks safe — our inference, not a vendor statement

GitHub Enterprise Server · GitHubgithub-action

60%

2.19 ≤ v < 2.19.212.20 ≤ v < 2.20.152.21 ≤ v < 2.21.62.19 2.20 2.21

Affected range stops below 2.19.21, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.20.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.21.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://enterprise.github.com/releases/2.19.21/notes

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://enterprise.github.com/releases/2.20.15/notes

x_refsource_MISCRelease NotesVendor Advisory

Source: [email protected]

https://enterprise.github.com/releases/2.21.6/notes

CVSS

4.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-285NVD-CWE-noinfo

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