Vulnerability-Lookup

CVE-2026-21885 (GCVE-0-2026-21885)

Vulnerability from cvelistv5 – Published: 2026-01-08 13:57 – Updated: 2026-01-08 15:55

Title

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

Summary

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.

Severity ?

6.5 (Medium)


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

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

URL

Tags

https://github.com/miniflux/v2/security/advisorie…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	miniflux	v2	Affected: < 2.2.16

Show details on NVD website

JSON

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GHSA-XWH2-742G-W3WP

Vulnerability from github – Published: 2026-01-07 19:22 – Updated: 2026-01-08 21:19

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

Severity ?

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.2.15"
      },
      "package": {
        "ecosystem": "Go",
        "name": "miniflux.app/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21885"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-07T19:22:14Z",
    "nvd_published_at": "2026-01-08T14:15:57Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nMiniflux\u0027s 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.\n\n### Details\n- **Vulnerable route**: `GET /proxy/{encodedDigest}/{encodedURL}` (accessible without authentication, but requires a server-generated HMAC-signed URL)\n- **Handler**: `internal/ui/proxy.go` (`(*handler).mediaProxy`)\n- **Trigger**: entry content is rewritten to proxy media URLs (e.g., `mediaproxy.RewriteDocumentWithAbsoluteProxyURL(...)`), producing signed `/proxy/...` URLs.\n- **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.\n\n### PoC\n1) Run Miniflux 2.2.15 with default configuration (media proxy enabled by default: `MEDIA_PROXY_MODE=http-only`).\n\n2) Log in with any normal user account.\n\n3) 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.:\n   - `\u003cimg src=\"http://\u003cinternal-target\u003e/secret\"\u003e`\n   (Note: `\u003cinternal-target\u003e` must be reachable *from the Miniflux process/network*; in containerized setups, `127.0.0.1` may not refer to the host.)\n\n4) Open the entry and locate the rewritten media proxy URL (`/proxy/\u003cencodedDigest\u003e/\u003cencodedURL\u003e`) in the rendered HTML/page source.\n\n5) Request the `/proxy/...` URL.\nExpected (vulnerable): Miniflux fetches the internal URL and returns the internal response (SSRF).\n\n### Impact\n**Type**: SSRF (Server-Side Request Forgery) via media proxy  \n**Who is impacted**: Miniflux instances with media proxy enabled (default configuration typically enables it for HTTP/mixed content handling).  \n**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.\n\n### Suggested CVSS (v3.1)\n`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N` (Base 6.5)\n\n\n\n\nIf there any questions or issues reproducing this, please contact: jeongwoolee340@gmail.com",
  "id": "GHSA-xwh2-742g-w3wp",
  "modified": "2026-01-08T21:19:09Z",
  "published": "2026-01-07T19:22:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/miniflux/v2/security/advisories/GHSA-xwh2-742g-w3wp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21885"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/miniflux/v2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Miniflux Media Proxy SSRF via /proxy endpoint allows access to internal network resources"
}

FKIE_CVE-2026-21885

Vulnerability from fkie_nvd - Published: 2026-01-08 14:15 - Updated: 2026-01-08 18:08

Severity ?

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/miniflux/v2/security/advisories/GHSA-xwh2-742g-w3wp
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/miniflux/v2/security/advisories/GHSA-xwh2-742g-w3wp

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Miniflux 2 is an open source feed reader. Prior to version 2.2.16, Miniflux\u0027s 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."
    }
  ],
  "id": "CVE-2026-21885",
  "lastModified": "2026-01-08T18:08:18.457",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-08T14:15:57.257",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/miniflux/v2/security/advisories/GHSA-xwh2-742g-w3wp"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/miniflux/v2/security/advisories/GHSA-xwh2-742g-w3wp"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-21885 (GCVE-0-2026-21885)

GHSA-XWH2-742G-W3WP

Summary

Details

PoC

Impact

Suggested CVSS (v3.1)

FKIE_CVE-2026-21885

Tags

Sightings

Nomenclature