GHSA-xwh2-742g-w3wp

Source

https://github.com/advisories/GHSA-xwh2-742g-w3wp

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-xwh2-742g-w3wp/GHSA-xwh2-742g-w3wp.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-xwh2-742g-w3wp

Aliases

Published

2026-01-07T19:22:14Z

Modified

2026-01-12T18:11:02.656453Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

Miniflux Media Proxy SSRF via /proxy endpoint allows access to internal network resources

Details

Summary

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.

Details

Vulnerable route: GET /proxy/{encodedDigest}/{encodedURL} (accessible without authentication, but requires a server-generated HMAC-signed URL)
Handler: internal/ui/proxy.go ((*handler).mediaProxy)
Trigger: entry content is rewritten to proxy media URLs (e.g., mediaproxy.RewriteDocumentWithAbsoluteProxyURL(...)), producing signed /proxy/... URLs.
Root cause: the proxy validates the URL scheme and HMAC signature, but does not restrict target hosts/IPs. As a result, requests to loopback/private/link-local addresses are allowed and fetched by the server.

PoC

1) Run Miniflux 2.2.15 with default configuration (media proxy enabled by default: MEDIA_PROXY_MODE=http-only).

2) Log in with any normal user account.

3) Subscribe to a feed you control that contains an entry with an image URL pointing to an internal address reachable from the Miniflux server, e.g.: - <img src="http://<internal-target>/secret"> (Note: <internal-target> must be reachable from the Miniflux process/network; in containerized setups, 127.0.0.1 may not refer to the host.)

4) Open the entry and locate the rewritten media proxy URL (/proxy/<encodedDigest>/<encodedURL>) in the rendered HTML/page source.

5) Request the /proxy/... URL. Expected (vulnerable): Miniflux fetches the internal URL and returns the internal response (SSRF).

Impact

Type: SSRF (Server-Side Request Forgery) via media proxy
Who is impacted: Miniflux instances with media proxy enabled (default configuration typically enables it for HTTP/mixed content handling).
Impact: attackers with a valid Miniflux account can fetch internal resources reachable from the Miniflux server (e.g., localhost services, private network services, and link-local endpoints such as 169.254.169.254), potentially exposing sensitive data.

Suggested CVSS (v3.1)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N (Base 6.5)

If there any questions or issues reproducing this, please contact: jeongwoolee340@gmail.com

Database specific

{
    "cwe_ids": [
        "CWE-918"
    ],
    "severity": "MODERATE",
    "nvd_published_at": "2026-01-08T14:15:57Z",
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-07T19:22:14Z"
}

References

Affected packages

Go / miniflux.app/v2

Package

Name: miniflux.app/v2; View open source insights on deps.dev
Purl: pkg:golang/miniflux.app/v2

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.2.16

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-xwh2-742g-w3wp/GHSA-xwh2-742g-w3wp.json"

last_known_affected_version_range

"<= 2.2.15"