CVE-2026-55185

Received Received - Intake

Path Traversal in Miniflux Feed Reader

Publication date: 2026-08-21

Last updated on: 2026-08-21

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-21

Last Modified

2026-08-21

Generated

2026-08-22

AI Q&A

2026-08-22

EPSS Evaluated

N/A

NVD

CVE-2026-55185

Affected Vendors & Products

Vendor	Product	Version / Range
miniflux	miniflux	2.3.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-601	The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Attack-Flow Graph

Executive Summary

Miniflux 2 before version 2.3.1 has a vulnerability in its URL handling. The IsRelativePath function incorrectly accepts redirect targets containing backslashes. Since Go URL parsing treats backslashes as path characters, browser normalization converts them to forward slashes, allowing an attacker to bypass security checks and redirect users to malicious external sites.

Detection Guidance

To detect this vulnerability, check if your Miniflux instance is running a version prior to 2.3.1. Use commands like 'curl -s https://your-miniflux-instance/ | grep -i version' or inspect the application logs for version details.

Impact Analysis

An unauthenticated attacker could trick you into clicking a malicious link during login, redirecting you to a fake site designed to steal credentials or install malware. This could lead to account compromise or unauthorized access to sensitive data.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations using affected Miniflux versions may face compliance violations and potential fines.

Mitigation Strategies

Upgrade Miniflux to version 2.3.1 or later immediately. If upgrading is not possible, restrict network access to the Miniflux instance and monitor login flows for suspicious redirect patterns.

Hi! I’m here to help you understand CVE-2026-55185. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70