Reusing a nonce, key pair in encryption issue exists in "FreeFrom - the nostr client" App versions prior to 1.3.5 for Android and iOS. If this vulnerability is exploited, the content of direct messages (DMs) between users may be manipulated by a man-in-the-middle attack.
https://play.google.com/store/apps/details?id=com.freefrom
https://jvn.jp/en/jp/JVN55045256/
https://apps.apple.com/us/app/freefrom-the-nostr-client/id6446819930