{"containers": {"cna": {"affected": [{"product": "GitHub Enterprise Server", "vendor": "GitHub", "versions": [{"lessThan": "2.19.21", "status": "affected", "version": "2.19", "versionType": "custom"}, {"lessThan": "2.20.15", "status": "affected", "version": "2.20", "versionType": "custom"}, {"lessThan": "2.21.6", "status": "affected", "version": "2.21", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "William Bowling"}], "descriptions": [{"lang": "en", "value": "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. 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