{"id":"CVE-2026-27944","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-27944","generatedAt":"2026-10-28T02:21:18.545Z","title":"Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and discloses the encryption keys required to decrypt the backup in the X-Backup-Security response header.","description":"Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and discloses the encryption keys required to decrypt the backup in the X-Backup-Security response header. This allows an unauthenticated attacker to download a full system backup containing sensitive data (user credentials, session tokens, SSL private keys, Nginx configurations) and decrypt it immediately. This issue has been patched in version 2.3.3.","published":"2026-03-05T19:16:06.000Z","lastModified":"2026-06-17T10:27:57.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-306","CWE-311"],"affected":["nginxui/nginx ui"],"epss":{"score":0.22936,"percentile":0.9773,"date":"2026-10-26","history":[{"date":"2026-09-24","score":0.01014,"percentile":0.61682},{"date":"2026-10-25","score":0.22936,"percentile":0.9773}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 22.9%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.22936,"from":0.01014,"percentile":0.9773},"summary":"EPSS moved from 1.0% to 22.9% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-24T00:00:00.000Z","detail":{"to":0.01014,"from":0.22162,"percentile":0.61682},"summary":"EPSS moved from 22.2% to 1.0% probability of exploitation in the next thirty days."}],"references":[{"url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762","tags":["Exploit","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-27944","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."}