{"schemaVersion":3,"id":"CVE-2023-28999","aliases":["UBUNTU-CVE-2023-28999","DEBIAN-CVE-2023-28999"],"status":"published","duplicateOf":null,"title":null,"description":"Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure and add new files.​ This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.","dates":{"published":"2023-04-04T12:51:08.241Z","modified":"2025-02-11T16:32:05.176Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.9,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.9,"severity":"medium","vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","exploitability":2.3,"impact":9.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","exploitability":2.3,"impact":9.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00678,"percentile":0.51483,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00678},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00678,"percentile":0.51483}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00678,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00678,"percentile":0.51483}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_462FCA5F05AF9731","name":"Exploit Reference (ethz.ch)","source":"reference","url":"https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-325","name":"Missing Cryptographic Step","description":"The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/325.html"},{"id":"CWE-311","name":"Missing Encryption of Sensitive Data","description":"The product does not encrypt sensitive or critical information before storage or transmission.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/311.html"}],"affected":[{"vendor":"debian","product":"nextcloud-desktop","name":"nextcloud-desktop","label":"nextcloud-desktop","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/nextcloud-desktop","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.9.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 3.9.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"nextcloud-desktop","name":"nextcloud-desktop","label":"nextcloud-desktop","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nextcloud-desktop","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"nextcloud","product":"desktop","name":"desktop","label":"desktop","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0, < 3.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, < 3.8.0","eol":null,"hubHref":"/vendor/nextcloud/desktop"},{"vendor":"nextcloud","product":"nextcloud","name":"nextcloud","label":"nextcloud","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.5, < 4.8.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.13.0, < 3.25.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.5, < 4.8.0 | ≥ 3.13.0, < 3.25.0","eol":null,"hubHref":"/vendor/nextcloud/nextcloud"},{"vendor":"nextcloud","product":"security-advisories","name":"security-advisories","label":"security-advisories","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0, < 3.8.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.13.0, < 3.25.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.0.5, < 4.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, < 3.8.0 | ≥ 3.13.0, < 3.25.0 | ≥ 3.0.5, < 4.8.0","eol":null,"hubHref":"/vendor/nextcloud/security-advisories"}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8","label":"github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT","Vendor Advisory"]},{"url":"https://github.com/nextcloud/desktop/pull/5560","label":"github.com/nextcloud/desktop/pull/5560","hostname":"github.com","tags":["X Refsource MISC","REPORT","Patch","Vendor Advisory"]},{"url":"https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf","label":"ethz.ch/content/…","hostname":"ethz.ch","tags":["X Refsource MISC","REPORT","Exploit","Technical Description","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-28999","label":"ubuntu.com/security/CVE-2023-28999","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-28999","label":"www.cve.org/CVERecord?id=CVE-2023-28999","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-28999","label":"security-tracker.debian.org/tracker/CVE-2023-28999","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2023-04-04T12:51:08.241Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-02-11T16:32:05.176Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":38,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T12:21:38.736Z","stale":false,"partial":false}}