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CVE-2026-53727 high CVSS 8.6

SSRF (Server-Side Request Forgery) in css_parser (CVE-2026-53727)

Summary

SSRF in css_parser (CVE-2026-53727). Confidential information can be exposed externally. Exploitable via ``css_parser``. Mitigation: upgrade to `3.0.0` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-53727** has been found in css_parser. Attackers can target a specific entry point like ``css_parser`` over the network to misuse the product. Confidential information can be exposed externally. CVSS score: 8.6/10. What to do: upgrade css_parser to **3.0.0** or later. If unsure, ask your IT team or search "css_parser CVE-2026-53727" on the vendor's site.
CVE-2026-53727 (css_parser) — CWE-918 / CVSS v3 8.6 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: `css_parser` / `uri.host` / `uri.scheme` / `Location` Patched: `3.0.0` — apply immediately 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
**SSRF** (CWE-918) exists in css_parser. Attackers reach the vulnerable code path via ``css_parser`` without authentication.
📍 Affected scope
css_parser — . Attack surface: `css_parser` / `uri.host` / `uri.scheme` / `Location`.
🔥 Severity
Severity: High (CVSS 8.6/10). Confidential information can be exposed externally
🔧 How to fix
Update to **3.0.0**.
🛡️ 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 request patterns matching this CVE's known IOCs. Run `grep -r 'css_parser' .` 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

  1. 1
    Identify exposure identify 
    grep -r 'css_parser' . | 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 `css_parser` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade css_parser to 3.0.0

    ステージング環境で 3.0.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。

  3. 7
    Post-deployment verification verify 
    Confirm patched version is live in production

    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

rubygems css_parser
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.0"}]}]

References

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