CVE-2026-55185: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in miniflux v2
Description
Miniflux v2 before version 2.3.1 contains an open redirect vulnerability due to improper handling of redirect URLs with backslashes. This allows an unauthenticated attacker to bypass relative-path and host checks in the login flow and redirect users to attacker-controlled external sites. The issue is fixed in version 2.3.1.
CVSS v4.0
Score 5.1medium
Affected software
miniflux
v2
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Miniflux 2, an open source feed reader, prior to version 2.3.1, has a URL redirection vulnerability (CWE-601) caused by the IsRelativePath function in internal/urllib/url.go accepting redirect targets containing backslashes. Go URL parsing treats backslashes as path characters, but browsers normalize them to forward slashes, enabling an attacker to bypass relative-path and host validation in the login flow. This allows an unauthenticated attacker to redirect victims to external malicious sites. The vulnerability is fixed in version 2.3.1.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to redirect users to attacker-controlled external websites, potentially facilitating phishing or other social engineering attacks. The vulnerability does not require privileges or authentication and has a medium severity with a CVSS 4.0 score of 5.1.
Mitigation Recommendations
Upgrade Miniflux to version 2.3.1 or later, where this open redirect vulnerability is fixed. No other mitigation is required as the fix is official and addresses the issue directly.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T15:20:43.086Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a88b714acd9273b49b41689
Added to database: 08/21/2026, 20:37:40 UTC
Last enriched: 09/11/2026, 02:33:39 UTC
Last updated: 10/05/2026, 18:48:20 UTC
Views: 55
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