CVE-2026-21885
MEDIUM
GHSA-xwh2-742g-w3wp
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4Description
Miniflux 2 is an open source feed reader. Prior to version 2.2.16, Miniflux's media proxy endpoint (`GET /proxy/{encodedDigest}/{encodedURL}`) can be abused to perform Server-Side Request Forgery (SSRF). An authenticated user can cause Miniflux to generate a signed proxy URL for attacker-chosen media URLs embedded in feed entry content, including internal addresses (e.g., localhost, private RFC1918 ranges, or link-local metadata endpoints). Requesting the resulting `/proxy/...` URL makes Miniflux fetch and return the internal response. Version 2.2.16 fixes the issue.
Analysis
Miniflux's media proxy endpoint is vulnerable to Server-Side Request Forgery (SSRF) in versions prior to 2.2.16, allowing authenticated users to craft malicious proxy URLs that force the application to fetch and expose responses from internal network resources including localhost and private IP ranges. An attacker with valid credentials can abuse this to access sensitive internal services and metadata endpoints by embedding specially crafted URLs in feed content. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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