<li>any copies that do not meet this requirement MUST be ignored.</li>
</ul>
<p>Outbound chat messages that are encrypted end-to-end are not often useful to receive on other resources. As such, they should use the <private/> element specified above to avoid such copying, unless the encryption mechanism is able to accommodate this protocol.</p>
<cveid="2017-5589"url="https://rt-solutions.de/en/cve-2017-5589_xmpp_carbons/">Multiple XMPP Clients User Impersonation Vulnerability</cve>
<cveid="2019-16235"url="https://gultsch.de/dino_multiple.html">Multiple Vulnerabilities found in Dino</cve>
<cveid="2020-26547"url="https://monal.im/blog/cve-2020-26547/">Missing sender verification for Carbons and MAM in Monal before 4.9</cve>