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UBUNTU-CVE-2026-21885
Vulnerability in miniflux (UBUNTU-CVE-2026-21885)
Summary
vulnerability in miniflux (UBUNTU-CVE-2026-21885). Confidential information can be exposed externally. Exploitable via `GET /proxy/{encodedDigest}/{encodedURL}`.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **UBUNTU-CVE-2026-21885** has been found in miniflux.
Attackers can target a specific entry point like `GET /proxy/{encodedDigest}/{encodedURL}` over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: ?/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "miniflux UBUNTU-CVE-2026-21885" on the vendor's site.
UBUNTU-CVE-2026-21885 (miniflux) —
Attack vector: remote (network-reachable) / no user interaction
Attack surface: GET /proxy/{encodedDigest}/{encodedURL}
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (unclassified) exists in miniflux. Attackers reach the vulnerable code path via `GET /proxy/{encodedDigest}/{encodedURL}` without authentication.
📍 Affected scope
miniflux — . Attack surface: GET /proxy/{encodedDigest}/{encodedURL}.
🔥 Severity
Severity: ?. Confidential information can be exposed externally
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual `GET /proxy/{encodedDigest}/{encodedURL}` requests with malformed payloads or SQL meta-characters. Run `grep -r 'miniflux' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'miniflux' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `miniflux` を grep し、稼働しているサービス・バージョンを把握する。
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3Hunt for indicators of compromise detect
grep 'GET /proxy/{encodedDigest}/{encodedURL}' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `GET /proxy/{encodedDigest}/{encodedURL}` への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。
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7Post-deployment verification verify
Replay attack against GET /proxy/{encodedDigest}/{encodedURL} on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Ubuntu:Pro:24.04:LTS
miniflux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
miniflux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
miniflux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:26.04:LTS
miniflux
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]