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I tagged a checker for cache GC3C2Z7 - ~!@#$%^&*()-_{}[]:;"',>.?/+ Cache Title Challenge. And these characters managed to break HTML on checker page:
<div class="cacheGroup" data-gccode="GC3C2Z7" data-cacheName="~!@#$%^&*()-_{}[]:;"',>.?/+ Cache Title Challenge">
The "data-cacheName" attribute value is not escaped and the contained " and > lets the text go out of the tag. This probably does not have any security implication, but it is a good practice to sanitize the external inputs. Also other occurrences of the cache name on the same page behaves a bit wrong sometimes.
We will look into this. As mirabilos says, it's actually a potential security issue (depending on what Geocaching.com filters out).