{"id":"CVE-2023-28998","summary":"Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys","details":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, 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.\u200b Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","aliases":["GHSA-jh3g-wpwv-cqgr"],"modified":"2026-08-12T03:51:35.800540666Z","published":"2023-04-04T12:45:42.156Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28998.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-325"]},"references":[{"type":"WEB","url":"https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28998.json"},{"type":"ADVISORY","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jh3g-wpwv-cqgr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28998"},{"type":"FIX","url":"https://github.com/nextcloud/desktop/pull/5323"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nextcloud/desktop","events":[{"introduced":"ff175088a391007b66bfca89ef35cf29e37cf001"},{"fixed":"b128a778253de91443de5f57f2421963515cd469"}],"database_specific":{"cpe":"cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"3.0.0"},{"fixed":"3.6.5"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-28998.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N"}]}