CVE-2026-55185
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.
Weakness
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.
References
- https://github.com/miniflux/v2/commit/c896bafdaa19c3f280b02b1059f84706495f1949
- https://github.com/miniflux/v2/pull/4362
- https://github.com/miniflux/v2/releases/tag/2.3.1
- https://github.com/miniflux/v2/security/advisories/GHSA-m999-j542-5w3r
- https://github.com/miniflux/v2/security/advisories/GHSA-m999-j542-5w3r
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