macaron before 1.3.7 has an open redirect in the static handler. Due to improper request santization, a specifically crafted URL can cause the static file handler to redirect to an attacker chosen URL, allowing for open redirect attacks.
github.com/go-macaron/macaron
github.com/go-macaron/macaron/commit/addc7461c3a90a040e79aa75bfd245107a210245
github.com/go-macaron/macaron/issues/198
github.com/go-macaron/macaron/issues/198#issuecomment-622885959
github.com/go-macaron/macaron/pull/199
github.com/go-macaron/macaron/pull/199/commits/6bd9385542f7133467ab7d09a5f28f7d5dc52af7
github.com/go-macaron/macaron/releases/tag/v1.3.7
lists.fedoraproject.org/archives/list/[email protected]/message/3QEUOHRC4EN4WZ66EVFML2UCV7ZQ63XZ
nvd.nist.gov/vuln/detail/CVE-2020-12666
pkg.go.dev/vuln/GO-2020-0039