Adobe Flash

The origins of Flash started as SmartSketch published by FutureWave Software in 1993. Eventually acquired via Adobe, Flash technology was announced end of life in 2020.  Flash has been disabled on the majority of operating systems and web browsers, excluding Chinese variants
(https://en.wikipedia.org/wiki/Adobe_Flash).

There are some orgnisations that may have dependencies on Adobe Flash for administrative functions, run Extensible Firmware interfaces (EFI) to update firmware. Aoobe Flash is also utilised within tools from SAS, Citrix and others.
https://www.ncsc.gov.uk/blog-post/enterprise-patching-in-a-post-flash-world

There are ~55,000 known websites that utilise Adobe Flash.
https://www.wappalyzer.com/technologies/programming-languages/adobe-flash/

Using Cybersecurity controls to block access to online resources based upon Categorisation, Deny Lists, Firewall rules etc is not effective as Data Loss Prevention technologies.
For users who have the capability to use Adobe FLash Player, the use of this upload method demonstrates they can easily move sensitive/confidential data outside of organisations.

Supporting legacy technologies increases the scope by which data can be transferred out of organisations, and the associated likelihood of a Data Loss risk event occurring must be considered.
The impact of a Data Loss risk event will depend on the content and amount of information that has been uploaded via the WAdobe Flash upload method.

Use DLP-TEST to assess: - 

- Coverage of DLP Technologies to detect data being uploaded via the Adobe Flash method.
- Capability of DLP Technologies to accurately detect sensitive/confidential data being uploaded via the Adobe Flash method.
- Ability of DLP technologies to ignore data being uploaded that is NOT sensitive or confidential.