These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround. Out of caution, several other checks have been audited or added. matrix-ios-sdk version 0.23.19 has been modified to only accept Olm-encrypted to-device messages. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. The problem may also be with the file itself if the above steps don't work.Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Check for the following problems with the FCXE file This can be done using the application (if it provides such options) or from the SPIRIT website and install the latest version. If, despite the association of the FileCapsule Deluxe program with the FileCapsule Deluxe Encoded file, the file still does not open, check the program version and possibly update it to the newest version. Update FileCapsule Deluxe to the latest version " box, this will allow you to permanently associate the FCXE file with the FileCapsule Deluxe application. However, it is important to check the "Always use the selected program. The program should be visible in the window, otherwise it should be selected manually using the "Browse" button and the program installation directory should be indicated. Changes can be made using the "Change" button. ![]() ![]() The displayed window will contain information about the program that supports this type of file. This option is available from the level of Properties of a specific file available in the context menu. If the application is or has been freshly installed, but the FCXE file still does not use the FileCapsule Deluxe program, it means no association. Create association of FileCapsule Deluxe with FCXE files
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