{"id":"UBUNTU-CVE-2023-28999","details":"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.\u200b 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.","modified":"2026-05-20T16:13:33.927560591Z","published":"2023-04-04T13:15:00Z","upstream":["CVE-2023-28999"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-28999"},{"type":"REPORT","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8"},{"type":"REPORT","url":"https://github.com/nextcloud/desktop/pull/5560"},{"type":"REPORT","url":"https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-28999"}],"affected":[{"package":{"name":"nextcloud-desktop","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/nextcloud-desktop?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.3-1","2.6.0-1","2.6.1-1","2.6.1-2","2.6.2-1","2.6.2-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"caja-nextcloud","binary_version":"2.6.2-1build1"},{"binary_version":"2.6.2-1build1","binary_name":"dolphin-nextcloud"},{"binary_version":"2.6.2-1build1","binary_name":"libnextcloudsync0"},{"binary_name":"nautilus-nextcloud","binary_version":"2.6.2-1build1"},{"binary_name":"nemo-nextcloud","binary_version":"2.6.2-1build1"},{"binary_name":"nextcloud-desktop","binary_version":"2.6.2-1build1"},{"binary_name":"nextcloud-desktop-cmd","binary_version":"2.6.2-1build1"},{"binary_version":"2.6.2-1build1","binary_name":"nextcloud-desktop-common"},{"binary_name":"nextcloud-desktop-l10n","binary_version":"2.6.2-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28999.json"}},{"package":{"name":"nextcloud-desktop","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/nextcloud-desktop?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.3-0ubuntu1","3.3.5-1","3.3.5-1ubuntu1","3.4.2-1","3.4.2-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"caja-nextcloud","binary_version":"3.4.2-1ubuntu1"},{"binary_name":"dolphin-nextcloud","binary_version":"3.4.2-1ubuntu1"},{"binary_name":"libnextcloudsync0","binary_version":"3.4.2-1ubuntu1"},{"binary_name":"nautilus-nextcloud","binary_version":"3.4.2-1ubuntu1"},{"binary_name":"nemo-nextcloud","binary_version":"3.4.2-1ubuntu1"},{"binary_name":"nextcloud-desktop","binary_version":"3.4.2-1ubuntu1"},{"binary_version":"3.4.2-1ubuntu1","binary_name":"nextcloud-desktop-cmd"},{"binary_name":"nextcloud-desktop-common","binary_version":"3.4.2-1ubuntu1"},{"binary_version":"3.4.2-1ubuntu1","binary_name":"nextcloud-desktop-l10n"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28999.json"}},{"package":{"name":"nextcloud-desktop","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/nextcloud-desktop?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.0-1","3.10.0-1","3.11.0-1","3.11.0-1.1build3","3.11.0-1.1build4"],"ecosystem_specific":{"binaries":[{"binary_name":"caja-nextcloud","binary_version":"3.11.0-1.1build4"},{"binary_name":"dolphin-nextcloud","binary_version":"3.11.0-1.1build4"},{"binary_version":"3.11.0-1.1build4","binary_name":"libnextcloudsync0t64"},{"binary_version":"3.11.0-1.1build4","binary_name":"nautilus-nextcloud"},{"binary_name":"nemo-nextcloud","binary_version":"3.11.0-1.1build4"},{"binary_version":"3.11.0-1.1build4","binary_name":"nextcloud-desktop"},{"binary_name":"nextcloud-desktop-cmd","binary_version":"3.11.0-1.1build4"},{"binary_name":"nextcloud-desktop-common","binary_version":"3.11.0-1.1build4"},{"binary_version":"3.11.0-1.1build4","binary_name":"nextcloud-desktop-l10n"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28999.json"}},{"package":{"name":"nextcloud-desktop","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/nextcloud-desktop?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.16.0-1","3.16.2-1","3.16.4-1","3.16.6-1","3.16.6-3"],"ecosystem_specific":{"binaries":[{"binary_name":"caja-nextcloud","binary_version":"3.16.6-3"},{"binary_name":"dolphin-nextcloud","binary_version":"3.16.6-3"},{"binary_name":"libnextcloudsync0t64","binary_version":"3.16.6-3"},{"binary_name":"nautilus-nextcloud","binary_version":"3.16.6-3"},{"binary_name":"nemo-nextcloud","binary_version":"3.16.6-3"},{"binary_name":"nextcloud-desktop","binary_version":"3.16.6-3"},{"binary_version":"3.16.6-3","binary_name":"nextcloud-desktop-cmd"},{"binary_name":"nextcloud-desktop-common","binary_version":"3.16.6-3"},{"binary_version":"3.16.6-3","binary_name":"nextcloud-desktop-l10n"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28999.json"}},{"package":{"name":"nextcloud-desktop","e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