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**Name of the Vulnerable Software and Affected Versions** Nextcloud Calendar app versions prior to 4.5.3 **Description** An issue exists where an attacker can gain access to the stacktrace and internal paths of the server when generating an exception while editing a calendar appointment. **Recommendations** For versions prior to 4.5.3, upgrade the Nextcloud Calendar app to version 4.5.3 to resolve the issue. As a temporary workaround, consider restricting access to the calendar editing feature until the upgrade is applied.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Server versions 25.0.0 through 25.0.10 Nextcloud Server versions 26.0.0 through 26.0.5 Nextcloud Server versions 27.0.0 through 27.0.0 Nextcloud Enterprise Server versions 22.0.0 through 22.2.10.15 Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.10 Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.6 **Description** The issue is related to the ability of an attacker to enable and disable the birthday calendar for any user on the same server, potentially allowing unauthorized access to protected information. **Recommendations** For Nextcloud Server versions 25.0.0 through 25.0.10, update to version 25.0.11 or later. For Nextcloud Server versions 26.0.0 through 26.0.5, update to version 26.0.6 or later. For Nextcloud Server version 27.0.0, update to version 27.1.0 or later. For Nextcloud Enterprise Server versions 22.0.0 through 22.2.10.15, update to version 22.2.10.16 or later. For Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.10, update to version 23.0.12.11 or later. For Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.6, update to version 24.0.12.7 or later.

**Name of the Vulnerable Software and Affected Versions** Nextcloud Server versions 25.0.0 through 25.0.10 Nextcloud Server versions 26.0.0 through 26.0.5 Nextcloud Server versions 27.0.0 through 27.0.1 Nextcloud Enterprise Server versions 25.0.0 through 25.0.10 Nextcloud Enterprise Server versions 26.0.0 through 26.0.5 Nextcloud Enterprise Server versions 27.0.0 through 27.0.1 **Description** The issue is related to the ability of admins to change authentication details of user-configured external storage in Nextcloud Server and Nextcloud Enterprise Server. This could allow a remote attacker to bypass existing access restriction policies. **Recommendations** For Nextcloud Server versions 25.0.0 through 25.0.10, update to version 25.0.11 or later. For Nextcloud Server versions 26.0.0 through 26.0.5, update to version 26.0.6 or later. For Nextcloud Server versions 27.0.0 through 27.0.1, update to version 27.1.0 or later. For Nextcloud Enterprise Server versions 25.0.0 through 25.0.10, update to version 25.0.11 or later. For Nextcloud Enterprise Server versions 26.0.0 through 26.0.5, update to version 26.0.6 or later. For Nextcloud Enterprise Server versions 27.0.0 through 27.0.1, update to version 27.1.0 or later.