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GHSA-f3cj-j4f6-wq85
Cross-Site Scripting (XSS) in svelte (GHSA-f3cj-j4f6-wq85)
Summary
cross-site scripting in svelte (GHSA-f3cj-j4f6-wq85). Risk of unauthorized operations or information disclosure. Exploitable via ``hydratable``. Mitigation: upgrade to `5.55.7` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **GHSA-f3cj-j4f6-wq85** has been found in svelte.
Attackers can target a specific entry point like ``hydratable`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade svelte to **5.55.7** or later.
If unsure, ask your IT team or search "svelte GHSA-f3cj-j4f6-wq85" on the vendor's site.
GHSA-f3cj-j4f6-wq85 (svelte) — CWE-79 /
Attack surface: `hydratable`
Patched: `5.55.7` — 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
**Cross-site scripting (XSS)** (CWE-79) exists in svelte. Attackers reach the vulnerable code path via ``hydratable`` without authentication.
📍 Affected scope
svelte — . Attack surface: `hydratable`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.55.7**.
🛡️ 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 'svelte' .` 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 'svelte' . | 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 `svelte` 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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6Apply patch patch
Upgrade svelte to 5.55.7ステージング環境で 5.55.7 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
svelte
[{"type":"SEMVER","events":[{"introduced":"5.46.0"},{"fixed":"5.55.7"}]}]
References
- package https://github.com/sveltejs/svelte
- web https://github.com/sveltejs/svelte/security/advisories/GHSA-f3cj-j4f6-wq85
- web https://github.com/sveltejs/svelte/commit/a16ebc67bbcf8f708360195687e1b2719463e1a4
- web http://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
- web https://github.com/advisories/GHSA-f3cj-j4f6-wq85