CVE-2023-22456

ViewVC, a browser interface for CVS and Subversion version control
repositories, as a cross-site scripting vulnerability that affects versions
prior to 1.2.2 and 1.1.29. The impact of this vulnerability is mitigated by
the need for an attacker to have commit privileges to a Subversion
repository exposed by an otherwise trusted ViewVC instance. The attack
vector involves files with unsafe names (names that, when embedded into an
HTML stream, would cause the browser to run unwanted code), which
themselves can be challenging to create. Users should update to at least
version 1.2.2 (if they are using a 1.2.x version of ViewVC) or 1.1.29 (if
they are using a 1.1.x version). ViewVC 1.0.x is no longer supported, so
users of that release lineage should implement a workaround. Users can edit
their ViewVC EZT view templates to manually HTML-escape changed paths
during rendering. Locate in your template set’s revision.ezt file
references to those changed paths, and wrap them with [format "html"] and
[end]. For most users, that means that references to [changes.path]
will become [format "html"][changes.path][end]. (This workaround should
be reverted after upgrading to a patched version of ViewVC, else changed
path names will be doubly escaped.)