Investigations are underway after at least three meetings on the video conferencing platform - including a legal education seminar on Tuesday (21.04.20) - were infiltrated with the vile footage.
A spokesperson for Zoom said: "These incidents are truly devastating and appalling, and our user policies explicitly prohibit any obscene, indecent, illegal or violent activity or content on the platform.
"Zoom strongly condemns such behaviour and recently updated several features to help our users more easily protect their meetings."
The most recent case saw law lecturer James Lee - a reader in English law at King's College London - was delivering a presentation to around 40 people.
The screens were all taken over 20 minutes into the meeting, and the incident has been referred to the National Crime Agency's Child Exploitation and Online Protection Centre.
NCA deputy director Charles Yates told the BBC: "The NCA is working with partners in the UK and abroad, law enforcement and private sector, to respond to these cases.
"Operators of these platforms need to do all they can to ensure their services aren't exploited or compromised in this way, particularly at a time when live streaming applications have reported significant increases in their use."
Meanwhile, the Zoom spokesperson also urged users to report any incidents" to the company themselves, or "directly to law enforcement authorities".