CVE-2026-21885 | Miniflux Media Proxy SSRF via /proxy endpoint allows access to internal network resources

Exp

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.

Published: 2026-01-08 Last update: 2026-01-12 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-21885 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-21885

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-21885

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-05 0.05% 0.04% -0.01%
2 2026-05-10 0.03% 0.05% +0.03%
3 2026-01-09 — 0.03% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-21885

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2026-21885

GitHub Security Advisory for CVE-2026-21885

GHSA-xwh2-742g-w3wp · Severity: medium · Ecosystem: go — Miniflux Media Proxy SSRF via /proxy endpoint allows access to internal network resources

OS Trackers for CVE-2026-21885

vendor priority summary link
debian not yet assigned CVE-2026-21885 not yet assigned priority: Debian including 1 source packages (miniflux), 3 status rows across 3 suites (forky, sid, trixie): resolved 2, open 1. https://security-tracker.debian.org/tracker/CVE-2026-21885
ubuntu medium CVE-2026-21885 medium priority: Ubuntu including 1 source packages (miniflux), 5 status rows across 5 suites (jammy, noble, plucky, questing, upstream): needs-triage 2, DNE 1, ignored 1, released 1. https://ubuntu.com/security/CVE-2026-21885

Affected software / configurations for CVE-2026-21885

Vendor Product Version Raw CPE
miniflux_project miniflux >= 2.0.0, < 2.2.16 cpe:2.3:a:miniflux_project:miniflux:*:*:*:*:*:go:*:*

References for CVE-2026-21885

cvelogic Threat Intelligence