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TI-2026-39867 Aliases CVE-2026-55185GHSA-m999-j542-5w3r

Miniflux 2: Open Redirect Bypass

Priority MEDIUM 56CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Spoofing
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00559 46th percentileScored 2026-11-07
Fix Fixed v2 (miniflux): 2.3.1miniflux.app/v2 (Go): 2.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
minifluxv2before 2.3.12.3.1Patch availableCNA
—miniflux.app/v2 (Go)before 2.3.12.3.1Patch availableGHSA-m999-j542-5w3r
  • v2 Vendorminiflux Affected before 2.3.1 Fixed in 2.3.1 Patch available CNA
  • miniflux.app/v2 (Go) Vendor— Affected before 2.3.1 Fixed in 2.3.1 Patch available GHSA-m999-j542-5w3r

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:miniflux_project:miniflux:*:*:*:*:*:*:*:*——miniflux
  • cpe:2.3:a:miniflux_project:miniflux:*:*:*:*:*:*:*:* Versions — — ·miniflux

Remediation

  • Fix · CNA v2 (miniflux) Fixed in 2.3.1
  • Fix · GHSA-m999-j542-5w3r miniflux.app/v2 (Go) Fixed in 2.3.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55185
  2. 2026-10-03 Alias added: GHSA-m999-j542-5w3r

References

Other 5

  • TI-2026-17586 Miniflux Media Proxy SSRF via /proxy endpoint allows access to internal network resources CVSS 3.1MEDIUM 6.5
  • TI-2026-70714 Server-side request forgery in Miniflux via per-feed proxy URL CVSS 4.0MEDIUM 5.3
  • TI-2025-41410 Miniflux 2 has an Open Redirect via protocol-relative `redirect_url` CVSS 4.0MEDIUM 5.3
  • TI-2023-12301 Unauthenticated Miniflux user can bypass allowed networks check to obtain Prometheus metrics CVSS 3.1HIGH 7.5
  • TI-2023-12302 Stored XSS in Miniflux when opening a broken image due to unescaped ServerError in proxy handler CVSS 3.1MEDIUM 5.4
  • TI-2025-22664 Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration CVSS 4.0MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences