{"id":"CVE-2026-103620","revision":null,"records":[{"revision":"1556447e663b45f7abfbcfe8b7c00c35","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103620","aliases":[],"title":"Missing authorization in GitHub Enterprise Server allowed repository writers to replace default branches via GraphQL","description":"A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. This vulnerability was reported via the GitHub Bug Bounty program.","state":0,"publishedAt":"2026-10-06T18:56:41.101+00:00","modifiedAt":"2026-10-07T16:32:08.448+00:00","affected":[{"ecosystem":"Vendor product","name":"Enterprise Server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"GitHub\",\n                    \"product\": \"Enterprise Server\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.18.0\",\n                            \"lessThan\": \"3.18.*\",\n                            \"changes\": [\n                                {\n                                    \"at\": \"3.18.16\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.19.0\",\n                            \"lessThan\": \"3.19.*\",\n                            \"changes\": [\n                                {\n                                    \"at\": \"3.19.13\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.20.0\",\n                            \"lessThan\": \"3.20.*\",\n                            \"changes\": [\n                                {\n                                    \"at\": \"3.20.9\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.21.0\",\n                            \"lessThan\": \"3.21.*\",\n                            \"changes\": [\n                                {\n                                    \"at\": \"3.21.7\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.22.0\",\n                            \"lessThan\": \"3.22.*\",\n                            \"changes\": [\n                                {\n                                    \"at\": \"3.22.2\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unknown\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":6,"severity":"MEDIUM"}],"references":["https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.16","https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.13","https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.9","https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.7","https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103620","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103620","identifiers":["CVE-2026-103620"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-99bdca71b3604150bbac354a4a9d8a89","complete":false,"records":13758,"lastAttemptAt":"2026-11-11T12:09:48.959833+00:00","lastSuccessAt":"2026-11-11T12:09:48.955+00:00","error":null,"lastVerifiedAt":"2026-11-11T12:09:48.955+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13489,"expectedIdentifiers":13812,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T11:57:48.1935565+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T11:57:48.1935565+00:00","lastSuccessAt":"2026-11-11T11:57:48.3433334+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:48.3433335+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-622dd4c770014d0cabbdd0941fabd46f","complete":true,"records":13752,"lastAttemptAt":"2026-11-11T11:57:48.9429139+00:00","lastSuccessAt":"2026-11-11T10:57:38.856+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:38.856+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13812,"expectedIdentifiers":13812,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T11:57:47.7728063+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:47.7728063+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T11:57:47.2778993+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:47.2778993+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-b178858a6ba5f2e20262964fa29d9573839d1b8b735abe524cc7d061ebde5c37","complete":true,"records":3088,"lastAttemptAt":"2026-11-11T11:57:48.1551807+00:00","lastSuccessAt":"2026-11-11T10:57:37.4490966+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:48.1551807+00:00","snapshotPublishedAt":"2026-11-11T10:48:28+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-085e065fc9050ae18408f7e722c39653aeb186872334d7b3ec1fcafb7ed43d25","complete":true,"records":231665,"lastAttemptAt":"2026-11-11T11:57:47.665155+00:00","lastSuccessAt":"2026-11-11T08:27:45.2700102+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:47.665155+00:00","snapshotPublishedAt":"2026-11-11T07:32:59+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}