From the NEWS file: Emacs 29.3 is an emergency bugfix release intended to fix several security vulnerabilities described below.
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Arbitrary Lisp code is no longer evaluated as part of turning on Org mode. This is for security reasons, to avoid evaluating malicious Lisp code.
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New buffer-local variable ‘untrusted-content’. When this is non-nil, Lisp programs should treat buffer contents with extra caution.
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Gnus now treats inline MIME contents as untrusted. To get back previous insecure behavior, ‘untrusted-content’ should be reset to nil in the buffer.
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LaTeX preview is now by default disabled for email attachments. To get back previous insecure behavior, set the variable ‘org–latex-preview-when-risky’ to a non-nil value.
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Org mode now considers contents of remote files to be untrusted. Remote files are recognized by calling ‘file-remote-p’.
😶