{"id":"CVE-2026-5845","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-5845","generatedAt":"2026-10-28T01:11:11.202Z","title":"An improper authorization vulnerability in scoped user-to-server (ghu_) token authorization in GitHub Enterprise Server allows an authenticated attacker to access private repositories outside the intended installation scope, which can include write…","description":"An improper authorization vulnerability in scoped user-to-server (ghu_) token authorization in GitHub Enterprise Server allows an authenticated attacker to access private repositories outside the intended installation scope, which can include write operations, via an authorization fallback that treated a revoked/deleted installation as a global installation context, which could be chained with token revocation timing and SSH push attribution to obtain and reuse a victim-scoped token. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.","published":"2026-04-21T23:16:22.000Z","lastModified":"2026-10-26T21:10:00.000Z","status":"Analyzed","sourceIdentifier":"product-cna@github.com","cvss":{"version":"4.0","score":7.2,"severity":"HIGH","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-639"],"affected":["github/enterprise server"],"epss":{"score":0.0029,"percentile":0.21413,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"},{"url":"https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"},{"url":"https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"},{"url":"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"},{"url":"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"},{"url":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"},{"url":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1","tags":["Release Notes","Vendor Advisory"],"source":"product-cna@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-5845","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}