Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M

CVE-2026-55185Miniflux 2: Open Redirect Bypass

Medium 5.1

In plain English

A medium-severity open redirect in v2 from miniflux. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.6%top 53.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	miniflux	no fix listed	DEBIAN-CVE-2026-55185
Debian:14	miniflux	2.3.2-1	DEBIAN-CVE-2026-55185
Go	miniflux.app	no fix listed	GO-2026-5500
Go	miniflux.app/v2	2.3.1	GHSA-m999-j542-5w3r
Go	miniflux.app/v2	2.3.1	GO-2026-5500

Affected products (as reported)

Vendor	Product	Versions
miniflux	v2	< 2.3.1

Weakness: CWE-601 · Vector: 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

References

https://github.com/miniflux/v2/security/advisories/GHSA-m999-j542-5w3r x_refsource_CONFIRM
https://github.com/miniflux/v2/pull/4362 x_refsource_MISC
https://github.com/miniflux/v2/commit/c896bafdaa19c3f280b02b1059f84706495f1949 x_refsource_MISC
https://github.com/miniflux/v2/releases/tag/2.3.1 x_refsource_MISC