To find a list of known issues in a particular Confluence version, you can create a filter in the Atlassian issue tracker and use the permlink located at the top right of the issue tracker's page to access the filtered report. The following example filter is the list of bugs reported for Confluence 2.7:

http://jira.atlassian.com/secure/IssueNavigator.jspa?reset=true&&type=1&pid=10470&fixfor=13115&version=13115&sorter/field=issuekey&sorter/order=DESC

Read the JIRA documentation on creating filters.

Confluence 2.10.3

Read the full release notes.

All Release Notes

Confluence 2.10

Confluence 2.9

Confluence 2.8

Confluence 2.7

Confluence 2.6

Confluence 2.5

Confluence 2.4

Confluence 2.3

Confluence 2.2

Confluence 2.1

Confluence 2.0

Confluence 1.4

Confluence 1.3

Confluence 1.2

Confluence 1.1

Confluence 1.0