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CVE-2026-59727
Cross-Site Scripting (XSS) in astro (CVE-2026-59727)
Summary
cross-site scripting in astro (CVE-2026-59727). Risk of unauthorized operations or information disclosure. Exploitable via ``attrs``. Mitigation: upgrade to `7.0.4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-59727** has been found in astro.
Attackers can target a specific entry point like ``attrs`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade astro to **7.0.4** or later.
If unsure, ask your IT team or search "astro CVE-2026-59727" on the vendor's site.
CVE-2026-59727 (astro) — CWE-79 /
Attack surface: `attrs` / `props` / `opts`
Patched: `7.0.4` — apply immediately
Workaround: Do not pass untrusted or request-derived input into `transition:persist`, `transition:scope`, or `transition:persist-props`.
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
**Cross-site scripting (XSS)** (CWE-79) exists in astro. Attackers reach the vulnerable code path via ``attrs`` without authentication.
📍 Affected scope
astro — . Attack surface: `attrs` / `props` / `opts`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **7.0.4**.
🛡️ Workaround
Workaround: Do not pass untrusted or request-derived input into `transition:persist`, `transition:scope`, or `transition:persist-props`.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'astro' .` 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
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1Identify exposure identify
grep -r 'astro' . | 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 `astro` 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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5Apply temporary workaround mitigate
Do not pass untrusted or request-derived input into `transition:persist`, `transition:scope`, or `transition:persist-props`.パッチが適用されるまでの応急処置として、Do not pass untrusted or request-derived input into `transition:persist`, `transition:scope`, or `transition:persist-props`. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade astro to 7.0.4ステージング環境で 7.0.4 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。
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7Post-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
npm
astro
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.4"}]}]
References
- web https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2
- web https://github.com/withastro/astro/pull/17212
- web https://github.com/withastro/astro/commit/7ba0bb1dc7516e88caff9abd7767322af44b0294
- web https://github.com/withastro/astro/releases/tag/[email protected]
- web https://github.com/advisories/GHSA-7pw4-f3q4-r2p2
- web https://nvd.nist.gov/vuln/detail/CVE-2026-59727