https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736
https://github.com/nextcloud/android/pull/8438
https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices
https://hackerone.com/reports/1189162
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