Martin Albrecht

**Name of the Vulnerable Software and Affected Versions** Nextcloud Desktop Client versions 3.0.0 through 3.6.4 **Description** The issue allows a malicious server administrator to recover and modify the contents of end-to-end encrypted files. This is a significant concern for users who rely on the Nextcloud Desktop Client for synchronizing files from Nextcloud Server. **Recommendations** For Nextcloud Desktop Client versions 3.0.0 through 3.6.4, upgrade to version 3.6.5 to receive a patch. At the moment, there is no other information about additional mitigation measures for this issue.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Desktop Client versions 3.0.0 through 3.6.4 **Description** A malicious server administrator can gain full access to an end-to-end encrypted folder, allowing them to decrypt files, recover the folder structure, and add new files. **Recommendations** For Nextcloud Desktop Client versions 3.0.0 through 3.6.4, upgrade to version 3.6.5 to receive a patch.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Desktop client versions 3.0.0 through 3.8.0 Nextcloud Android app versions 3.13.0 through 3.25.0 Nextcloud iOS app versions 3.0.5 through 4.8.0 **Description** A malicious server administrator can gain full access to an end-to-end encrypted folder, allowing them to decrypt files, recover the folder structure, and add new files. **Recommendations** For Nextcloud Desktop client versions 3.0.0 through 3.7.0, update to version 3.8.0. For Nextcloud Android app versions 3.13.0 through 3.24.0, update to version 3.25.0. For Nextcloud iOS app versions 3.0.5 through 4.7.0, update to version 4.8.0.

Name of the Vulnerable Software and Affected Versions: iOS versions prior to 12.1 macOS Mojave versions prior to 10.14.1 tvOS versions prior to 12.1 watchOS versions prior to 5.1 iTunes versions prior to 12.9.1 iCloud for Windows versions prior to 7.8 Description: An issue existed in the method for determining prime numbers, which was addressed by using pseudorandom bases for testing of primes. Recommendations: For iOS versions prior to 12.1, update to iOS 12.1 or later. For macOS Mojave versions prior to 10.14.1, update to macOS Mojave 10.14.1 or later. For tvOS versions prior to 12.1, update to tvOS 12.1 or later. For watchOS versions prior to 5.1, update to watchOS 5.1 or later. For iTunes versions prior to 12.9.1, update to iTunes 12.9.1 or later. For iCloud for Windows versions prior to 7.8, update to iCloud for Windows 7.8 or later.