A security issue has been discovered in Q2A (affecting all versions) so we're releasing a new version, 1.7.5. Big thanks to 'l3m0n' who reported the issue. I've informed Gideon, who should prepare a download and update the website soon. UPDATE: v1.7.5 now available here.
In the meantime, the quickest and simplest fix is to replace the file qa-include/qa-install.php in your site with this one from the Q2A Github repository. I recommend all site owners do this asap. (Alternatively you could delete the file as it's not required after you've installed Q2A.)
The fix has also been pushed to the master and dev branches on Github so you can download the latest code from there if you like. This also includes some other minor bug fixes that were in the dev branch and due to be part of 1.8, but they will be in 1.7.5 instead:
After update my site category list not show. Why?
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
April 20, 2021: Q2A 1.8.6 released!