The most recent info I’ve seen is that LLMs are, of course, great at discovering vulnerabilities, but not yet good at patching them.
NOTE: Also other AI can fix security issues, OpenAI Codex ChatGPT is NOT the only one. Most AI is trained with same code from Internet. Also Claude has fixed many security issues already.
For WeKan, when I have received responsible security disclousure, Claude and ChatGPT Pro have fixed many vulnerabilities, and those security researchers have confirmed that those vulnerabilities are now fixed. AI has added tests, that check that those vulnerabilities are not reintroduced to codebase. If someone tries to override permissions, those attempts are logged to Admin Panel Problems Security.