I tested just now with the 'ocaml' repo: http://caml.inria.fr/svn/ocaml/trunk
The hyperlinks work fine from both the main page and the specific build page, so I am not able to reproduce. Can you provide more details? Or do you have a public repo that reproduces this?

Thanks @mdonohue for your comment.

Attached is the screenshot of what we see in our Jenkins. Please note that <br> is missing at the beginning where the hyperlink should have been create (at least this is what we think is causing the issue).

<a href='https://bugzilla/.../?id=1234'>Bug 1234</a><br>$COMMIT_MESSAGE

Please let me know if you need more info.

Thanks

What plugin is causing those 'fisheye' links? I think another plugin is processing the text and changing the angle brackets.

Ok, the git plugin provides 'fisheye' links. I tried a Git repo, with fisheye enabled. Still can't repro your problem. Are you able to make a test install of Jenkins with just the git + bugzilla plugins, and reproduce this problem? I think it's some other plugin interacting.

We're using Subversion Plug-in version 2.6

I am still not able to reproduce with the subversion plugin, alongside Fisheye integration. It's very difficult to guess what the root cause is without a way to reproduce the problem. Can you try building a test Jenkins setup, and add one plugin at a time, until the problem reproduces there?

Our Jenkins instance is very large with many plugins installed, it is impossible for us to install the plugins one by one and narrow this down. I tried to downgrade the subversion plugin to see if anything would change but the downgrade broke a few other plugins and I had to quickly revert back and install the latest version of subversion plugin. If it helps, I can provide you with the list of our plugins.

Sorry, I'm volunteering here - you'll need to do the legwork to get this one fixed. it's almost certainly not the bugzilla plugin at fault.