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Tetra WebBBS 6.11 is mainly a security release.
I won't go into any details because advice is pretty simple:
Update/upgrade your forums to version 6.11 immediately. - Period.

Other than the fix the new release comes with a few more improvements and two minor new features:

• Pagination line on the message index page now includes an option to directly jump to any message index page. This improves navigation on larger sites with a huge number of index pages.
• When posting a new message the preview page now offers a "Post" button right below the preview area and above the postform. This was suggested by a contributor some months ago for better usability. However, the button utilizes JavaScript. But that's certainly a minor issue these days.

More detailed information about changes, fixes and new features of the current Tetra WebBBS 6.1x series to be found in Release notes for Tetra-WebBBS 6.10.

Further reading:
For updates from 6.10 or upgrades from older versions please read the setup guide.
For downloads please visit the download page.