Cross-Site Scripting (XSS) in copyparty (CVE-2026-27948)
Summary
Cross-site scripting in copyparty (CVE-2026-27948). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.20.9 or later.
Original description
The description as published by the source.
Copyparty is a portable file server. In versions prior to 1.20.9, an XSS allows for reflected cross-site scripting via URL-parameter ?setck=.... Version 1.20.9 fixes the issue.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-27948 has been found in copyparty.
Risk of unauthorized operations or information disclosure.
What to do: upgrade copyparty to 1.20.9 or later.
If unsure, ask your IT team or search "copyparty CVE-2026-27948" on the vendor's site.
CVE-2026-27948 (copyparty) — CWE-79
Attack vector: remote (network-reachable) / unauthenticated
Patched: 1.20.9 — 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.
Cross-site scripting (XSS) (CWE-79) exists in copyparty.
Check the vendor advisory for the affected versions of copyparty.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.20.9.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'copyparty' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'copyparty' . | 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
copypartyを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade copyparty to 1.20.9ステージング環境で 1.20.9 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を含めること。
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3Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com