Coppermine Photo Gallery in versions 1.6.09 through 1.6.27 is vulnerable to path traversal. Unauthenticated remote attacker is able to exploit a vulnerable endpoint and construct payloads that allow to read content of any file accessible by the the web server process.This issue was fixed in version 1.6.28.
Improper Limitation of a Pathname to a Restricted Directory The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.