When user downloads PGP or S/MIME keys/certificates, exported file has same name for private and public keys. Therefore it's possible to mix them and to send private key to the third-party instead of public key. This issue affects ((OTRS)) Community Edition: 5.0.42 and prior versions, 6.0.27 and prior versions. OTRS: 7.0.16 and prior versions.
https://otrs.com/release-notes/otrs-security-advisory-2020-11/
https://lists.debian.org/debian-lts-announce/2023/08/msg00040.html
https://lists.debian.org/debian-lts-announce/2020/05/msg00000.html