{"id":"UBUNTU-CVE-2026-55185","details":"Miniflux 2 is an open source feed reader. Prior to 2.3.1, IsRelativePath in internal/urllib/url.go accepts redirect targets containing backslashes because Go URL parsing treats them as path characters. Browser backslash normalization converts them to forward slashes. An unauthenticated attacker can provide such a redirect_url value to the login flow, bypass the relative-path and host checks, and redirect a victim to an attacker-controlled external site. This issue is fixed in version 2.3.1.","modified":"2026-09-02T19:36:19.865175271Z","published":"2026-08-21T21:17:00Z","upstream":["CVE-2026-55185"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-55185"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-55185"},{"type":"REPORT","url":"https://github.com/miniflux/v2/security/advisories/GHSA-m999-j542-5w3r"},{"type":"REPORT","url":"https://github.com/miniflux/v2/pull/4362"}],"affected":[{"package":{"name":"miniflux","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/miniflux?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.51-1","2.0.51-2","2.0.51-2ubuntu0.1","2.0.51-2ubuntu0.2","2.0.51-2ubuntu0.2+esm1","2.0.51-2ubuntu0.3","2.0.51-2ubuntu0.3+esm1","2.0.51-2ubuntu0.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.51-2ubuntu0.3+esm2","binary_name":"miniflux"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55185.json"}},{"package":{"name":"miniflux","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/miniflux?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.6-2","2.2.13-1","2.2.16-2","2.2.16-2ubuntu0.26.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.16-2ubuntu0.26.04.1~esm1","binary_name":"miniflux"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55185.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}