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CVE-2020-10518 Details

Description

A remote code execution vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration of the underlying parsers used by GitHub Pages were not sufficiently restricted and made it possible to execute commands on the GitHub Enterprise Server instance. To exploit this vulnerability, an attacker would need permission to create and build a GitHub Pages site on the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 2.22 and was fixed in 2.21.6, 2.20.15, and 2.19.21. The underlying issues contributing to this vulnerability were identified both internally and through the GitHub Security Bug Bounty program.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://enterprise.github.com/releases/2.19.21/notes	CVE	Release NotesVendor Advisory
https://enterprise.github.com/releases/2.20.15/notes	CVE	Release NotesVendor Advisory
https://enterprise.github.com/releases/2.21.6/notes	CVE	Release NotesVendor Advisory
https://enterprise.github.com/releases/2.19.21/notes	[email protected]	Release NotesVendor Advisory
https://enterprise.github.com/releases/2.20.15/notes	[email protected]	Release NotesVendor Advisory
https://enterprise.github.com/releases/2.21.6/notes	[email protected]	Release NotesVendor Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information to Classify Weakness	[email protected]
CWE-77	Improper Neutralization of Special Elements used in a Command ('Command Injection')	[email protected]

Affected Products

Product	Versions
github github	< 2.19.21 >= 2.20.0, < 2.20.15 >= 2.21.0, < 2.21.6
CPE cpe:2.3:a:github:github:::::enterprise:::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Dec 20, 2021	Reanalysis	[email protected]
Sep 3, 2020	Initial Analysis	[email protected]