Recently a security issue allowing allowing local code execution after visiting a malicious URL was identified in Subversion, git and Mercurial. All three source control systems released a synchronised security update.
In RAD Studio, we use an external installation of both git and Mercurial, which you point the IDE to in the Options dialog. (Tools > Options > Version Control, and then either the git or Mercurial subitems.) Update whichever distribution you use.
However, we do ship Subversion DLLs, which could be affected by this issue. These can be easily updated, and we have internally tested new DLLs against RAD Studio 10.2.1. You can find full instructions in the readme.txt in the \bin\subversion folder - for me this is C:\Program Files (x86)\Embarcadero\Studio\19.0\bin\subversion . A rough summary is:
The readme file has full details.
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