# CVE-2026-55185: Miniflux 2: Open Redirect Bypass

> An attacker can bypass redirect checks in Miniflux 2 to redirect victims to malicious external sites via crafted login URLs.

- **Severity:** Medium 5.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 21 Aug 2026
- **Updated:** 24 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-55185, GHSA-m999-j542-5w3r, GO-2026-5500, UBUNTU-CVE-2026-55185

## What is CVE-2026-55185?

CVE-2026-55185 is a medium-severity vulnerability in miniflux v2, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2026-55185?

4 open source packages ship an affected version, including miniflux.app/v2 and miniflux.app.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `miniflux.app/v2` | Go | All versions | 2.3.1 |
| `miniflux.app/v2` | Go | All versions | 2.3.1 |
| `miniflux.app/v2` | Go | All versions | 2.3.1 |
| `miniflux.app` | Go | All versions | None |

## How do I fix CVE-2026-55185?

Upgrade miniflux.app/v2 to 2.3.1 or later.

## Is CVE-2026-55185 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55185 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55185 and fix it if it is affected.

What it is: CVE-2026-55185 is a medium-severity vulnerability in miniflux v2, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55185 exists.

Affected packages and fixed versions:
- miniflux.app/v2 (Go): affected all versions; fixed in 2.3.1
- miniflux.app/v2 (Go): affected all versions; fixed in 2.3.1
- miniflux.app/v2 (Go): affected all versions; fixed in 2.3.1
- miniflux.app (Go): affected all versions; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-55185/ (Markdown: https://insights.sbomify.com/CVE-2026-55185/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55185
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55185
- OSV: https://osv.dev/vulnerability/CVE-2026-55185

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55185/
Summaries are generated and may contain mistakes; the official description above is the record.